I have a similar problem
I have cut 4 hours of video (mixed avi, mpg, vob from different cameras) and stil pics l(jpeg) into one movie a little over one hour long, added transitions etc and was nearly to the stage of adding a music background
after spending hours on this movie I've just about finished with video editing when for no apparrent reason
Half of my movie shows on the sceneline as 'Media Offline' (red screen written in various languages)
This happened while i was editing. I haven't changed anything. Movie is stored in C Drive on computer
All my original movie clips seem to still be in the Project & Organizer View panels
I dragged one from the Project View panel, over the corresponding 'Media Offline' panel in the sceneline and
it inserted it into the movie and brought back the original clip so now it is doubled up ! ??? (the 'Media Offline" clip shows clip title and plays for same length of time)
Bugger ! While I've been typing this question a couple of the 'Media Offline' squares have gone back to showing movie clips in the sceneline
I've just noticed
the sound plays while 'Media Offline ' clip is playing
some start as 'Media Offline and change to the movie clip part way through playing
some avi, mpeg,vob files are OK some show as 'Media Offline
there doesn't seem to be any consistency with anything thats happening
It sounds like PrE is loosing contact with the HDD, where the media is stored and linked. That can happen with a failing HDD, a failing controller chip, active-scan, real-time anti-virus, anti-malware, or anti-anything, which seizes all files and surveys them (media files are large, so this can take some time) them, before allowing the OS, or the program access to them. I would investigate those possibilities. A failing HDD is a biggie, if happening. A controller chip, if built into the MoBo (most will be), is a biggie too. The anti-whatever programs should be turned OFF, when editing.
Those are the first possibilities that come to my mind, but there could be other causes too. If you were accessing media from an external, then the cable would be suspect, in additon to those possibilities.
It all got to hard !
Everything I'm using is more than 5 years old
Seems my Panasonic DV camera is to old and I'm using a dinosaur version of Premiere Elements on a computer that can't cope with the workload
Best solution seems to be to chuck the whole lot in the bin and go out and purchase all new stuff !
So I purchased a new computer and had PE 11 installed
Computer shop couldn't figure out the problem but managed to move my video from old computer to the new one so I managed to finish my video
plugged in the "old" camera to work on a new movie
It doesn't work
So I'm off now to watch my 1960s super 8 movies instead
I would go watch my 1950s black and white TV but they've just changed everything to digital and i can't enjoy that anymore
Depending on the OS on the new computer, it could be that the driver for the IEEE-1394a (iLink/FireWire-400) is not working, as it should. In your System>Hardware>Device Manager, check the IEEE-1394a driver, and if not set to "Legacy," do so. Reboot, and then test your camera.
Good luck, and hope that helps,