This issue has just surfaced, but then up until now I didn't have a projector connected.
There is no mode that the projector doesn't support that the TV does, both TV and projector are connected through a link box but both should output the same resolution.
I am seeing issues where MC19 crashes or plays video without sound, if I launch directly from the disk it seems to work - if I launch in MC19 it crashes more than it works and has twice now left the system in an 'unsupported' frequency state - although the frequency is supported - all that I can do is reset the HTPC via a remote connection.
I have temporarily disabled MC19's ability to change the screen automatically and had no problems since so it is clearly something to do with 'attempted' and failed resolution change - but why would this affect whether audio was available from the movie etc ? i.e the movie plays but no sound is received by the receiver.