Hi, I have a 733 G4 with 6-hundred something RAM and my QX v4.11 is locking up ("unexpectedly quits") in the middle of my work. It has never done that before. I recently installed Real Player 8 but ditched it and all its' files. I was thinking is might be some offending extension related to RP since it was the only SW change that has been made. I rebuilt the DT, ran NU--disk doctor and speed disk. I still get the lockup and used Sherlock to locate anymore RP files. I found a few more but I thought they were already on the machine since purchase and like I said, there were no probs until now. I moved them to "disabled extensions" or trashed. Thoughts?