Are you using 5.00 or 5.01?
Memory management seems to have a negative effect on response times when switching applications. When returning to PR, it looks like it must regain acccess to memory, that is has released earlier to other applications and that takes time. There have been reports of severe lagging, but this should have been resolved to a large degree in 5.01.
I am currently using 5.01 having upgraded from 5.00. The problem has not been rectified by upgrading.
Thanks but can't do it until tomorrow when I am back in my office and in front of the culprit (PC).
Thanks for help so far.
I have seen similar issues with MAC not with Windows
Try run the Application as the administrator or switch off the UAC of the OS this should solve the problem .
I have finally resolved this problem and it is several weeks since the "fix" with no repeat of the problem.
I uninstalled Nero from my system and straight away the problem resolved.
I noticed that prior to removing Nero that it was taking priority over Quicktime which, I think, was causing the conflict with codec for the Canon DSLR files in Premier.
It has now been 4 weeks since I removed Nero and there has been no sign of the problem of the video footage stopping in playback on the timeline.