I downloaded the new update and right away things changed. All of my dock items would not open unless I at least double clicked on them. Then today when I start up, I get nothing but the flashing question mark. Tonight I will do the disk utility things (maybe reset the PRAM). I'll post results tomorrow. I just wanted to throw this out for everyone's info sake. Or if anyone has heard of something similar anywhere. (I'm seeing some printer issues but that's about it) thanks!