I started a new project in Premiere Pro 6. I'm not sure if it is relevant, but one thing I did differently on a new project was change the DV to HDV, the only time I've done that.
Then when I was importing by dragging from CS6 Bridge a bunch of videos, it looked like they were disappearing, or being moved instead of copied, so I terminated and started over. But after that some thumbnails switched icons and won't play in CS6 preview, though they do when clicked to open in media player.
I think when I finished the video and was starting to export, that a window came up and said dynamic link fail or something. I'd never seen before. Back in CS6, I went to a backup disk and copied the video files that here had thumbs, and copied to the folder with the icons. They had the same number code, but had text in front on the originals. Once I compared to make sure all thumbs and icons were represented, I deleted the icons, and then renamed the thumbs according to my current naming system, so they were just like the replaced ones.
I had exported to queue, and now ran the queue. I got the dynamic link error again, and when I looked back in CS6, the replaced thumbs had become icons like before. Since I still had the window with the other backup disk open, I copied those. But this time, even though they lacked the text in front of them, they arrived as icons instead of thumbs also. I thinkperhaps it is because PP can recognize that they are the same files even though they have different name. Because when I have changed the names of files that are already in a video sequence, and PP asks where the file is, and I indicate the file, it accepts it with the new name, though the old one still shows in the sequence, and doesn't need to be redone when reopened.
The icons, when in PP do play as normal and the export went normally. But the icons won't play in the Bridge preview, and now it seems I can't get back thumbs at all.