Ok.....
Creating a new Photos library under the same user results in the same behaviour.
Creating a new user and opening Photos shows the spash screen as expected but on the second open it is all as it should be.
Now here is the interesting part. Going back to the first user and opening Photos again, it didn't show the splash screen and the Photos library was the System Library but on the next open it had reverted to showing the splash screen and the System Library de-selected.
I can't do the safe-mode check because I am off site and troubleshooting remotely but will do the next time I am at my parents.
EtreCheck Report:
EtreCheck version: 3.4.6 (460)
Report generated2017-12-1807:18:34
Download EtreCheck fromhttps://etrecheck.com
Runtime:5:25
Performance:Below Average
Click the[Lookup]links for more information from Apple Support Communities.
Click the[Details]links for more information about that line.
Problem:No problem - just checking
Hardware Information:ⓘ
iMac (21.5-inch, Mid 2011)
[Technical Specifications]-[User Guide]-[Warranty & Service]
iMac - model: iMac12,1
1 2.8 GHz Intel Core i7 (i7-2600S) CPU: 4-core
12 GB RAM Upgradeable -[Instructions]
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
BANK 0/DIMM1
2 GB DDR3 1333 MHz ok
BANK 1/DIMM1
2 GB DDR3 1333 MHz ok
Handoff/Airdrop2: not supported
Wireless:en1: 802.11 a/b/g/n
Video Information:ⓘ
Intel HD Graphics 3000 - VRAM: 512 MB
AMD Radeon HD 6770M - VRAM: 512 MB
iMac 1600 x 900
Disk Information:ⓘ
WDC WD1001FALS-403AA0 disk1: (1 TB) (Rotational)
[Show SMART report]
EFI (disk1s1 - MS-DOS FAT32) <not mounted>[EFI]: 210 MB
HDD1 (disk1s2 - Journaled HFS+) /Volumes/HDD1 : 999.35 GB (962.80 GB free)
Recovery HD (disk1s3 - Journaled HFS+) <not mounted>[Recovery]: 650 MB
APPLE SSD TS256C disk0: (251 GB) (Solid State - TRIM: Yes)
[Show SMART report]
EFI (disk0s1 - MS-DOS FAT32) <not mounted>[EFI]: 210 MB
(disk0s2) <not mounted>[APFS Container]: 250.79 GB
OPTIARC DVD RW AD-5690H()
USB Information:ⓘ
USB20Bus
Apple Inc. FaceTime HD Camera (Built-in)
hub_device
Western Digital Elements 25A2
Elements 25A2 disk4: (2 TB)
EFI (disk4s1 - MS-DOS FAT32) <not mounted>[EFI]: 210 MB
IHB-1 (disk4s2 - Journaled HFS+) /Volumes/IHB-1 : 2.00 TB (1.56 TB free)
Recovery HD (disk4s3 - Journaled HFS+) <not mounted>[Recovery]: 650 MB
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
USB20Bus
hub_device
USB2.0 Hub
VIA Labs, Inc. USB2.0 Hub
USB 2.0 Hub [MTT]
USB 2.0 Hub [MTT]
USB 2.0 Hub [MTT]
USB 2.0 Hub [MTT]
Apple Computer, Inc. IR Receiver
Apple Internal Memory Card Reader
Thunderbolt Information:ⓘ
Apple Inc. thunderbolt_bus
LaCie d2 TBT2 USB3
ST3000DM001-1ER166 disk3: (3 TB) (Rotational)
[Show SMART report]
EFI (disk3s1 - MS-DOS FAT32) <not mounted>[EFI]: 210 MB
PHOTOS_01 (disk3s2 - Journaled HFS+) /Volumes/PHOTOS_01 : 750.00 GB (510.88 GB free)
BACKUP_02 (disk3s3 - Journaled HFS+) /Volumes/BACKUP_02 : 2.25 TB (1.32 TB free)
Virtual disks:ⓘ
HDD (disk2s1 - APFS) /[Startup]: 250.79 GB (68.75 GB free)
Physical disk: disk0s2 250.79 GB (68.75 GB free)
(disk2s2) <not mounted>[Preboot]: 250.79 GB
Physical disk: disk0s2 250.79 GB
(disk2s3) <not mounted>[Recovery]: 250.79 GB
Physical disk: disk0s2 250.79 GB
(disk2s4) /private/var/vm[VM]: 250.79 GB
Physical disk: disk0s2 250.79 GB
System Software:ⓘ
macOS High Sierra10.13.2 (17C88) - Time since boot: about 5 hours
Gatekeeper:ⓘ
Mac App Store and identified developers
Kernel Extensions:ⓘ
/System/Library/Extensions
[not loaded] com.livescribe.kext.LivescribeSmartpen (1.0)[Lookup]
System Launch Agents:ⓘ
[not loaded] 6 Apple tasks
[loaded] 174 Apple tasks
[running] 110 Apple tasks
System Launch Daemons:ⓘ
[not loaded] 34 Apple tasks
[loaded] 178 Apple tasks
[running] 120 Apple tasks
Launch Agents:ⓘ
[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed2017-10-14)[Lookup]
[loaded] com.citrix.AuthManager_Mac.plist (? 1ce99fae 57953573 - installed2014-11-06)[Lookup]
[running] com.citrix.ReceiverHelper.plist (? 75b63b97 f87ad377 - installed2014-11-06)[Lookup]
[running] com.citrix.ServiceRecords.plist (? 8e6543d d49a1f01 - installed2014-11-06)[Lookup]
[loaded] com.google.keystone.agent.plist (Google, Inc. - installed2017-12-15)[Lookup]
[loaded] com.oracle.java.Java-Updater.plist (? 9ae0225f 72ac4dde - installed2017-11-03)[Lookup]
[running] com.teamviewer.teamviewer.plist (TeamViewer GmbH - installed2017-12-18)[Lookup]
[running] com.teamviewer.teamviewer_desktop.plist (TeamViewer GmbH - installed2017-12-18)[Lookup]
Launch Daemons:ⓘ
[loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed2017-10-14)[Lookup]
[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed2017-10-14)[Lookup]
[failed] com.adobe.fpsaud.plist (? 2afb3af7 6cf41d3c - installed2016-04-16)[Lookup]
[running] com.bombich.ccchelper.plist (Bombich Software, Inc. - installed2017-10-17)[Lookup]
[running] com.fitbit.galileod.plist (Fitbit, Inc. - installed2017-09-25)[Lookup]
[loaded] com.google.keystone.daemon.plist (Google, Inc. - installed2017-10-13)[Lookup]
[failed] com.livescribe.PenCommService.plist (? ce8953a9 81089673 - installed2013-10-01)[Lookup]
[loaded] com.macpaw.CleanMyMac3.Agent.plist (MacPaw Inc. - installed2017-11-03)[Lookup]
[loaded] com.microsoft.autoupdate.helper.plist (Microsoft Corporation - installed2017-10-06)[Lookup]
[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed2017-09-06)[Lookup]
[loaded] com.teamviewer.Helper.plist (TeamViewer GmbH - installed2017-08-24)[Lookup]
[running] com.teamviewer.teamviewer_service.plist (TeamViewer GmbH - installed2017-12-18)[Lookup]
User Launch Agents:ⓘ
[running] com.akamai.single-user-client.plist (? 9ecda9e0 f4f704a9 - installed2017-09-26)[Lookup]
[loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed2017-08-11)[Lookup]
[running] com.ecamm.printopia.plist (Decisive Tactics, Inc. - installed2016-03-09)[Lookup]
[loaded] com.macpaw.CleanMyMac3.Scheduler.plist (MacPaw Inc. - installed2017-10-14)[Lookup]
[loaded] com.skype.skype.shareagent.plist (Skype Communications S.a.r.l - installed2017-08-15)[Lookup]
[running] com.spotify.webhelper.plist (Spotify - installed2017-12-17)[Lookup]
User Login Items:ⓘ
CCC User Agent Application - Hidden (Bombich Software, Inc. - installed2017-11-03)
(/Applications/Carbon Copy Cloner.app/Contents/Library/LoginItems/CCC User Agent.app)
ScanSnap Manager Application - Hidden
(/Applications/ScanSnap/ScanSnap Manager.app)
Photo Transfer App Application - Hidden
(/Applications/Photo Transfer App.app)
Fantastical Launcher SMLoginItem - Hidden (Apple, Inc. - installed2017-12-18)
(/Applications/Fantastical 2.app/Contents/Library/LoginItems/Fantastical Launcher.app)
Internet Plug-ins:ⓘ
JavaAppletPlugin: Java 8 Update 151 build 12 (installed2017-11-03)Check version
LogMeInSafari64: 1.0.730 (installed2012-07-12)[Lookup]
net.juniper.DSSafariExtensions: Unknown (installed2013-05-22)[Lookup]
AdobePDFViewerNPAPI: 17.012.20098 (installed2017-12-05)[Lookup]
FlashPlayer-10.6: 21.0.0.226 (installed2016-04-28)[Lookup]
LogMeIn: 1.0.730 (installed2012-07-12)[Lookup]
Silverlight: 5.0.61118.0 (installed2015-12-14)[Lookup]
QuickTime Plugin: 7.7.3 (installed2017-12-18)
Flash Player: 21.0.0.226 (installed2016-04-28)Outdated!Update
CitrixICAClientPlugIn: 11.9.0 (installed2014-10-04)[Lookup]
LogMeInSafari32: 1.0.730 (installed2012-07-12)[Lookup]
AdobePDFViewer: 18.009.20050 (installed2017-12-05)[Lookup]
CANONiMAGEGATEWAYDL: 3.2.0.1 (installed2012-12-10)[Lookup]
MeetingJoinPlugin: 1.0 (installed2017-10-06)[Lookup]
Safari Extensions:ⓘ
[not loaded] 1Password - AgileBits -http://agilebits.com/onepassword(installed2013-12-30)
[not loaded] 1Password - AgileBits -https://agilebits.com/onepassword(installed2016-04-13)
[enabled] Evernote Web Clipper - Evernote Corp. -http://evernote.com(installed2015-08-22)
3rd Party Preference Panes:ⓘ
Akamai NetSession Preferences (installed2017-10-06)[Lookup]
Flash Player (installed2016-04-16)[Lookup]
Java (installed2017-11-03)[Lookup]
Printopia (installed2016-03-11)[Lookup]
Time Machine:ⓘ
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
HDD: Disk size: 250.79 GB Disk used: 182.04 GB
PHOTOS_01: Disk size: 750.00 GB Disk used: 239.12 GB
Destinations:
BACKUP_02 [Local]
Total size: 2.25 TB
Total number of backups: 84
Oldest backup:24/1/17, 01:13
Last backup:18/12/17, 06:31
Size of backup disk: Adequate
Backup size 2.25 TB > (Disk used 421.16 GB X 3)
Top Processes by CPU:ⓘ
26%rsync
16%rsync
12%TeamViewer_Desktop
10%WindowServer
9%kernel_task
Top Processes by Memory:ⓘ
1.25 GBkernel_task
314 MB mds_stores
228 MB TeamViewer_Desktop
204 MB photolibraryd
192 MB photoanalysisd
Top Processes by Network Use:ⓘ
Input Output Process name
642 KB 10 MB TeamViewer_Service
4 MB 257 KB mDNSResponder
74 KB 52 KB apsd
19 KB 1 KB netbiosd
13 KB 552 B SystemUIServer
Top Processes by Energy Use:ⓘ
21.60 WindowServer
17.18 Fantastical 2
17.18 rsync
13.36 rsync
11.64 TeamViewer_Desktop
Virtual Memory Information:ⓘ
5.37 GBAvailable RAM
1.11 GBFree RAM
6.63 GBUsed RAM
4.25 GBCached files
44 MB Swap Used
Software installs (last 30 days):ⓘ
Photo Transfer App: 3.54 (installed2017-11-24)
Scapple: 1.30 (installed2017-11-30)
Scapple: 1.30.1 (installed2017-12-03)
Adobe Acrobat Reader DC (18.009.20050):(installed2017-12-05)
Fantastical: 2.4.4 (installed2017-12-18)
Install information may not be complete.
Diagnostics Events (last 3 days for minor events):ⓘ
2017-12-18 01:33:08 Last shutdown cause: 3 - Hard shutdown
2017-12-18 00:58:23 WindowServer High CPU use[Open][Details]
2017-12-17 21:57:54 Photos.app Hang[Open]
2017-12-17 14:40:00 Scan to Evernote2.app High CPU use[Open][Details]