Mouse settings revert to default at login
Hi. I have a Mac Mini (Late 2014) running OS X Yosemite V 10.10.2, and 4 users profiles on the machine. I have a bluetooth Apple keyboard and magic mouse connected to the Mac.
When I am logged on, I can set the mouse speed, scroll direction etc., and the Mac remembers my settings. However, when any other user logs on and changes their settings, the next time they log off and back on again the mouse settings have reverted back to their defaults - very annoying for them. If I plug a standard PC type USB mouse in to the Mac, the same thing happens - i.e. the Mac does not remember the mouse settings.
Can anyone please advise how these settings can be made permanent?
Thanks
Mac mini (Late 2014), OS X Yosemite (10.10.2)