welcome Scottt!
1. can you try to find which folder is making HFS crash?
you may eventually look at the "exceptionlog" file that's created. it may contain useful info for me to fix it.
you may restrict to folders as workaround, but i'd like to just fix it.
2. never met the solution.
3. i don't exactly know how the thumbnails folder is handled by tpgen, etc.
anyway, there are many ways you can hide that folder.
one is to hide the folder, as an attribute of the folder, at system level (i mean, Windows).
by default HFS will not show hidden items.
another one is to right click on the folder, in the Virtual File System pane, then "properties" > flags > hidden.
if such folders have all the same name, let's say "thumbnails", you can right click on the home/root > properties > file mask > folders filter
enter this value:
\thumbnailsthere are even more methods, but i hope it's enough.