Q: Little dots automatically fill the password field

Same problem. OSX 10.10.5

I had to re-install OSX El Capitan from scratch and had the same very annoying issue with a clean install on my late 2014 iMac. Thought it was the keyboard at first as when I switched it off and lost, and then re-connected bluetooth it solved the problem, although temporarily.

However, when I re-installed my Norton Internet Security 2016 onto the clean install of El-Capitan and did a full scan, it found 4 files in the download folder which the anti-virus deleted. I've not had the problem since - so far so good.

I also have a Macbook Pro with Norton installed and never had this issue on that with El Capitan. Also, I never had this issue on the iMac when I upgraded to El-Capitan with anti-virus already installed. People say that you don't need an anti-virus for OSX but with a big sway away from PC's to Macs there ARE more people writing virus's, trojans etc for OSX.

The only common denominator in my own experience is that this particular problem is not an issue on my Macs that have Norton installed. I don't have any other anti-virus software but try one for yourself and see if the scan finds any malware etc. There are loads that allow you to download and use for a limited time as a trial so nothing really to lose but potentially something to gain.

Good luck.

Norton Antivirus (made by Symantec) has a very long and illustrious reputation for mangling Mac OS X systems, sometimes to the point where a complete reinstall is necessary. Among other things, it installs kernel extensions which are known to cause kernel panics and system freezes; it contains known and documented bugs which can silently corrupt Adobe Photoshop and Adobe InDesign files, destroy a user's ability to authenticate as an administrator, and (on PPC systems) can cause Classic to stop functioning; and Symantec has on at least two occasions now released flawed .dat file updates which erroneously report certain critical Mac OS X files as "viruses." (Deleting these "viruses" causes damage to the system that in some cases renders it unbootable.)

Norton has also been reported as damaging iPhone backups.

A major security flaw in Norton has also been noted:

http://www.macnn.com/articles/15/05/08/contentious.utility.ignored.apple.guideli nes.created.zero.day.exploit.128538/

Norton Removal Tool (Symantec Uninstaller):

http://www.symantec.com/business/support/index?page=content&id=TECH103489&locale =en_US

You might want to consider starting a new discussion. Since this one is a couple of years old, less people are likely to look at it. A new post would be much more visible. You can link to this one.