I'm afraid I, too, am having this issue, which also may be of my own making. For me it also involves movement to a new PC, so I made the mistake of thinking I'd be fine. I sent in an e-mail with the log as instructed, but thought I'd post it here as well in case this gets noticed first.
Thank you guys, as well, for your support! The MiG-21bis is one of my favorite modules for this sim.