It could be a number of issues, and without knowing more about your system and your project it's hard to say.
But try just zooming in or out from your timeline (press the + or - key) and see if that unlocks it.
Thanks I'll try that next session. If it doesn't cure it I'll give you more
Thanks Steve Grisetti.
I have since had two trouble-free sessions. I then caused the "Block" again by trying to drag the time stretch (clock) icon (experimentally) onto the clip instead of my usual right-click>select time stretch. I tried + & - ing the timeline as suggested but it didn't cure it.
My project captured (scene detected) well from two digital video tapes of 40 mins and 30 mins and am editing now into the 30 min clips.
My System: Dell Inspiron. 2CPUs Pentium III 3000Mhz. 500GB HD 56% used ATI Radeon HD2400Pro. 4GB Ram. Vista SP1 Home Premium 32bit.
Just bought Windows 7 but will not install it until this project is finished.
Has nobody else found this <I/I> problem?
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I still don't know anything about your source files -- what kind of camcorder they came from and how you got them into your computer.
But -- particularly since your SP for Vista is outdated by SP2 -- I'd definitely recommend doing to the upgrade to Windows 7 as soon as possible. It's a remarkably smooth move from Vista, and you're highly unlikely to lose any work or data. It could likely solve virtually any operating system related problems you're having!
I may have found how to cure the problem . . . . I clicked on the "Select" tool icon at left of the timestretch clock icon and it seems to have put it right. I can now adjust volumes, move clips etc. But, on previous occasions it must have been some other unknown wrong thing I did because I had never used the "clock" icon before ?
Sorry I missed this bit . . . .
The camcorder is a Panasonic NV-GS75EB 3CCD providing excellent footage. Transferred direct to computer via Firewire to IEEE 1394 adaptor.
I'll install Windows 7 shortly following your recommendation.
This camcorder is ideal for interfacing with Premiere Elements!
I'm almost certain that, once you make the leap to Windows 7, your issues will disappear! (Though, depending on your system's performance with things like the Aero interface, you may want to streamline the look a bit, per the FAQs to the right of this forum: http://forums.adobe.com/thread/415316?tstart=0 )
Since you are using PE 4.0, I am not sure if it would even work with WIn 7, since Win 7 was not present at the time when PE 4 was released.
If you are upgrading to Win 7, I'd suggest you to upgrade to PRE 8.0 which has a lot of new cool features as well.