i have experienced an occasional bug where TotalFinder gets messed up when mounting disk images. the icons for the disk image in the TotalFinder window will animate however the images don’t mount.
i have just had this happen with the current version of TotalFinder and OS X 10.10, however it has happened with earlier versions of TotalFinder, and also on Mavericks.
the bug seems to occur after some disk images have been successfully mounted previously…
one other thing, if I restart the Finder, then the disk images that weren’t working all suddenly mount. so it’s like the mounting process is getting stuck somewhere.