I hope another bit of info helps track this, I have recreated this issue three times consistently; here is what leads to it in my case:
Using Win 7 x64 Ultimate, Premiere Pro 6.0.2 (creative cloud subscription)
I am working on an edit using all CineForm HD footage (in Premiere 6.0.2).
I used the "Replace with after effects composition" command on a clip in a sequence. This, of course, then loads After Effects. Often, when I use this dynamic link feature, I find that my After Effects composition becomes complex enough that it won't play smoothly in Premiere in realtime, so I go ahead and render it from After Effects as a video and just imort that into Premiere.
Thus, I render from After Effects to a new CineForm HD encoded file.
I import the new CineForm footage into Premiere, delete the automatically imported After Effects composition and replace the AE comp in my Premiere sequence with the rendered CineForm footage.
When I close Premiere, I now have the "Metadata writing in progress..." dialog box with 1 file pending. I've repeated this process with two other clips and get the exact same result (now I have 3 files pending). I have several other dynamic linked AE comps in my sequences as well.
I'm guessing the issue is only related the CineForm video file rendered from After Effects in my case (and not the use of dynamic link / imported AE compositions), but I wanted to explain who I got it to happen.
As a random side note, my Premiere seems to post-close-crash everytime I close it. The window closes all the way, then about five seconds later, I get a report that PPro has crashed.
