So....ever since upgrading...and before that, dating back to Leopard...I haven't had any major issues with my Mac systems. That changed yesterday. I was using an external keyboard (microsoft, as that's all I had handy, one of the older Natural Ergonomic keyboards). Ever since I unplugged it...whenever i type, my cursor jumps around, deleting large blocks of text, re-inserts them where I had them, removes random letters, etc. I've tried rebooting, doing the PRAM/SMC resets...verifying settings for the keyboard/trackpad...but nothing seems to be working.
Any ideas?
Any ideas?