Hi,
My project plays fine in stereo when it is first opened. I change the interleave to Mono on the master bus now and then to help with mixing decisions. But once I do that the project behaves oddly. It will no longer preview in real stereo. When I pan an channel hard L or R the overall volume dips, but the sounds is still centered. If I close and reopen the project it is fine until I preview in mono again.