heh!

Nice find:
if len(thumbFile)>1 and as.path.exists(thumbFile):

as.path

os.path sounds more like the correct one. I had a look at my latest version (1.7 alpha 3) and it's fixed in there.

If I have any time in the weekend, I'll do a fix round on the 1.7 and launch it to the general public and not just in the garage.