I am in the same position with the large file sizes & I am using the pro version, at one point I managed to get up to 6GB in the incomplete folder.

I am also finding problems with deleting some of the files, even after completing a full reboot & completing the deletions from the dos prompt I still have 0 byte files which the system tells me are in use.

I have now set file retention to 1 day to stop my machine filling with files that can not be used this has helped with the symptoms of the problem but it would be nice to fix the problem itself.