Sorry that is not correct. FS9 can go to 16x on autopilot and return to 1X
without any problem. The only thing that happens is the AI gets readjusted
I have not tried it in FSX yet as I need courage to start it up!
So if the OP is correct then they either took out the feature or its a bug.
And even if it cant return to 1X after more than 4X why freeze up the PC?. I
think its another bug...
Also if its as real as it gets then there should never be anything but 1X.
The only ones allowed more is Kirk and the SSE....and they call it warp :-)