I cant’ get thumbnails to show. Latest version/updates on both, Yosemite and TF. List and other views work.
Assuming you mean “Icon View”. This is a known Finder bug under current version of Yosemite. You have to drag sidebar splitter slightly to get them to display. You can try to drag the splitter with basic Finder without TotalFinder running and you will see the same bug in action.
I’m not going to fix this one. I have plenty of my own bugs in TotalFinder to fix 