Macbook pro changes user picture on its own . Help please.

Question

Does this mean I have some sort of malware?
Reccently my mac started changing my user photo on its own. Even more strangely the photos are only from photobooth.

Answer 1

You likely have a corrupt cache file someplace in OS X.
12: OnyX cache cleaning
This routine cleans all possible corrupt caches, doesn't delete your data or programs.
Apple doesn't include a easy for the user, system wide cache cleaning process in OS X, something they need to consider implementing.
So we have to depend upon third party software to do this and the best, time tested and free one is OnyX
Sometimes a corrupted cache file can cause strange behavior, slow machine, Dock and fonts doesn't work, beachballs effect, something won't install, Safari acting up etc., just general strangeness that can't be explained. Web browsing slow when all the other machines are fast etc.,
Use the free OnyX matching your OS X version and run all the initial checks
Run all the maintenance and cleaning aspects (except don't delete the log files) and reboot at the end (must)
If any of the initial checks OnyX does gives a warning, then Stop and report, you have a serious drive or other issue.
This will give OS X a enema of sorts (won't delete file or programs) and let it rebuild all the cache and other files, including Spotlight.
You must be through running all the maintenance and cleaning aspects as this is a "catch all" method and any number of corrupted caches may be responsible for your issues. Don't worry, OS X will work fine (and likely faster again) after the caches are cleaned out and rebuilt from their original sources provided you REBOOT when finished using OnyX.
http://www.macupdate.com/app/mac/11582/onyx    https://en.wikipedia.org/wiki/OnyX
List of proven OnyX successes:
https://discussions.apple.com/message/18377471?ac_cid=sa123456#18377471
OnyX also has a Verify > Preferences
(plist) file checker, show the corrupt ones and write them down. So while your in OnyX cleaning your caches, check for corrupted plist files too for the next step below.
Step by Step to fix your Mac