I had the same problem last night...
I ended up running the TivoDesktopCleaner (downloaded from support site), then reinstalling, and I also moved all of the videos out of the folder that I was using to transfer videos.
When I first started I had about 200gb of random files under the folder I was using to transfer, I believe that was the cause of my problem.
Anyway, try the cleaner for sure, and if you have videos in that folder try to do it without them.
Good luck.
I ended up running the TivoDesktopCleaner (downloaded from support site), then reinstalling, and I also moved all of the videos out of the folder that I was using to transfer videos.
When I first started I had about 200gb of random files under the folder I was using to transfer, I believe that was the cause of my problem.
Anyway, try the cleaner for sure, and if you have videos in that folder try to do it without them.
Good luck.