I'm not able to open Photos, either. I tried getting an old library from the time machine, copying that and opening with that and it won't work. Here is my error message:
Process: Photos [898]
Path: /Applications/Photos.app/Contents/MacOS/Photos
Identifier: com.apple.Photos
Version: 1.0.1 (215.65.0)
Build Info: PhotoApp-215065000000000~1
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Photos [898]
User ID: 501
Date/Time: 2015-09-01 14:20:35.613 -0400
OS Version: Mac OS X 10.10.4 (14E46)
Report Version: 11
Anonymous UUID: E6B377BF-57B3-7866-836F-33854483F9F1
Sleep/Wake UUID: 2D50BDF9-4877-49D3-9CB7-28C809219D25
Time Awake Since Boot: 6300 seconds
Time Since Wake: 870 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Application Specific Information:
Photo Foundation logging:
2015-09-01 14:20:00.861: Received changes notification alert: <LiModelChangeGroup: 0x60800106fc00> alert flags : Replay Complete (__59-[RKFaceChangesHandler startListeningForChangesFromMarker:]_block_invoke_2:173)
Crashing on exception: *** -[NSConcreteTextStorage attributesAtIndex:longestEffectiveRange:inRange:]: Range or index out of bounds
Does this make any sense to you? Can you help? Thanks so much!