Okay. So I just saw something completely wack happen with the 5.5f launcher. After running, mounting, then exiting DaemonTools, the launcher will pop a prompt for No disc found in drive G:, insert disc and try again. (or something to that effect). Clicking any of the 3 buttons abort, cancel, retry or the x at the top will bypass this without issue. Telling the launcher to run the game will bring up the same warning again.
After a system restart, I played around with different parameters, but was unable to duplicate the bug. I mentioned Daemontools only because drive G is the virtual drive it mounts to.