> i'm going to do more fiddling which means i'll end up with a lot of rubbish in tp. so if i want to "reset" everything that i've tested and start from scratch with a clean tp/td4,,, is there a reset button or something?
No, there's no Undo for folder operations! When you move folders around in TP, it's the actual folders (and their contents, i.e. your image files) that get moved on your harddisk.
The reason why you have to do it in TP is that if you had used Explorer, or another file manager, ThumbsPlus would not know what you have done and it would be unable to match-up its thumbnail records to your image files.
So, sure, you can practice safely on some test folders, but keep in mind that whatever you are doing is 'real'!