No matter though, if you can duplicate this with 9.3 in Simulation Mode, I will try to reproduce it here on 9.3, and then I can validate it is fixed on 9.4. I tried just now to duplicate this issue on 9.3, but with no luck.
Do you have Diagrams set to show "Fullscreen" mode? And you say Auto-Taxi is off... which would have been my first guess is that this feature was just malfunctioning.
I'd really like to work with you on this to make sure this is resolved. After you send me a bug report, put in the email text a reference to this forums thread, so that i know it's you. We'll get this resolved via email.
Thanks!