I’m about to put 1.6.7 to beta channel:
http://totalfinder.binaryage.com/beta-changes#1.6.7
I tested it myself under clean 10.8, 10.9 and 10.10 systems. But I would be glad if you guys could test it too. TotalFinder should launch after installation and after next system reboot.
My conclusion is that the bug was there all the time, but it got exposed when I changed the code. For example 1.6.6 works fine under 10.8. It simply does not expose same behaviour as under 10.9 and 10.10.