This may be something already covered in the forum, but searches on "Manchester" and "KMHT" did not turn anything up.
Two taxiways for this airport in New Hampshire are missing. In a look down view, it appears that the taxiways just stop and don't go all of the way to the runway end for runway 6 at KMHT.
In fact the pink line taxi directions and the radio include the actual runway 6 as the last taxi leg. This of course causes some AI confusion, etc. I checked and the real airport does have the missing taxiways.
The reason I'm posting here is to have someone see if their KMHT has the same problem. I'm not aware of anything other than the default airport and AI planes that I am running. I have to put it that way because there might be other things I've added that could have caused this.
As an aside, I used AFCAD to install a KHMT1.txt AFCAD file for the airport in an attempt to try to fix the problem. The new AFCAD file clearly showed the missing taxiways so I "saved" it but the problem is still there?