I have done most if not all of the suggestions on this forum, but the issue of auto deleting is still happening. It originally happened while writing an email on Yahoo, so I assumed it was a glitch of theirs, but then it began on other programs. It will just automatically start deleting everything (including whole emails!). It has happened on Facebook, Pages, etc. it seems to be related in some way to a keyboard stroke, but my keyboard is a Mac keyboard and it is in good shape (haven't spilled anything on it or done anything to it) and my computer is a Mac mini 2015 with Yosemite, the latest version. I changed out the mouse, thinking it was that. So apparently some if not all of these issues are not solved by changing out keyboards or even the mouse or trying to set certain settings. I did all of those too. Would it have anything to do with an incompatibility with the keyboard and the newer version of Mac? I have thought this all along but was checking forums to see, but others have changed out and done the same thing. Is it anything to do with the mouse? Again, I use a usb connected mouse, no bluetooth and hardwired to the computer and believe it definitely can be a bluetooth issue, but, alas I don't have that either. I also checked keystroke settings and we'll see if that helps, because if it is sensitive I could see where the delete key could just start deleting. The only way I've stopped it is to click on the esc key or just clicking out of the window and going to another window or just clicking to desktop! This is really something Mac needs to address if I'm seeing this on a forum about deleting text then something isn't right. And just as i was finishing up this not, it starting deleting!! Better hurry and send it before it's gone again!