An invalid track path and then RB Restart. I would like if RB find an incorrect path to do not restart or freeze.
It doesn't restart or freeze - when the path is invalid, file does not exist or can not be read for some reason, it will just show an error message Unable to play! Error code = 2 (unable to open the file/invalid server address)
and move on to the next file in the playlist.
If it crashes on your PC - check it for viruses first, as I said before, the error reports are strange and it looks like the error is outside of RB.
If it worked fine before - then check what changed in the system, probably it's the source of the problem.