Hi all,
Apologies for Vague-posting (will follow up with more detail), but I thought better flag caution on this one - for me, it broke my path to the projector (current Epson laser, model to follow), as in - from OS side, it reported ok, in QLab (restarted/rebooted), I could get no content (neither grid, route marks, or cue content) on, while on the OS side, I could slide windows across and it worked.
Same show file, no other changes, worked before and after in 5.5.6, broke in 5.5.7 (had to revert quickly for an important rehearsal).
When I am back in a bit more than 24hrs, I'll report with all other details (Make/Model of PJ, Generation of MacBook Pro and installed OS) to assist with troubleshooting - but of course I hope and trust this is more of an isolated incident pertaining to our particular combo of those factors above - only though worth giving out the warning in case anyone else is in a similar boat.
Cheers,
Freddy