TotalFinder suddenly not working

I started have problems with TotalFinder 1.5.6 since last night. When I try to open a new Finder window or even the Trash, there is a “flash” on the desktop as if a window is opening and then nothing opens. Repeated tries yield the same result. Stopping TotalFinder and using the plain vanilla Apple Finder seems to work fine but I really miss the dual pane setup in TotalFinder for moving files, this is the reason I bought TotalFinder in the first place.

Thanks in advance for your help