Recently we have been getting reports of some issues with Transmit, QuickCursor and other applications that use Apple events to communicate with TextMate. Thanks to Brian Webster and Michael Tsai this has been tracked down to a bug in the
appleeventsd process in 10.8.2, hopefully this will be fixed quickly by Apple.
A workaround for Transmit would be to mount the server as a hard drive and open the files from there as it would bypass the bug, this would also work in other file transfer programs that have this feature. You can get more information and alternative workarounds at the their respective posts linked above.