I deleted the fsuipc.ini.  Of course it rebuilt itself but the problem persists.  Actually, it's also happening on the 757 as well.  Since there is no dedicated CaptainSim support I hope someone from the developer will help with this.  Right now both are unflyable.  BTW, I'm using v4.5.3 and I will be happy to supply whatever is needed to fix this. It's quite an investment for the aircraft to be sitting in the hanger.  Surely, someone can resolve this.