I've noticed a few weird issues with DFW and the AI following my taxi instructions (which could be incorrect).
Issue 1
I've issued an aircraft some instructions to taxi to 17R via L EG. Eventually i told that aircraft to line up and wait. That aircraft then crossed over 17R and circled back to 17R via EF, then 'lined up and waited'. I had a similar issue with an aircraft I sent to 18L via WG, this aircraft crossed over 18L then circled back to the runway via WF.
example instruction for this issue is something like "AAL0032 taxi to runway 17R via K EG". The aircraft then taxis and holds short of 17R. Upon the 'AAL0032 Line up and wait' command, the aircraft crosses over 17R at EG then turns around via EF to line up and wait on 17R.
This issue is reproducable on both 17R and 18L.
Issue 2
A different issue i've encountered is the various cross over taxiways between the aprons and Taxiway K and Taxiway L.
So far I've found that K9, K8, K6 and K5, when included in taxi instructions to the apron will cause the AI aircraft to just hold in place. What is interesting is if I tell an aircraft to taxi to apron via K or L, the aircraft will use these various taxi ways with out specification, though most of the time they use the center most (EJ, K8, EM for example) taxi - to - apron cross over point closest to their gate.
Now I could be instructing these arrivals wrong so please correct me if I am. Here are some examples -
1 - Aircraft arrived on 17C, exited runway on M3 - instructed aircraft to "Taxi to Apron via K8" as the arrival gate was on the north side of C concourse. Aircraft just held in place at M3. I had a lot going on and would have had a deal as there was already another arrival running out 17C and yet another arrival about 3nm out for 17C. I had to close the game here, didn't want to lose a load of points :).
2 - aircraft arrived on 13R, exited at A3 - instructed aircraft to "Taxi to apron via A L K6" as the arrival gate was on the south side of the A Councourse. Again, the aircraft just held in place at A3. A further instruction of "taxi to apron via A L" worked fine, but i had to hold the aircraft in place on L to let some departures use EJ to get onto K and L for 17R.
I haven't had many arrivals to the B or D concourses so I'm not sure if those are affected in the same way.
Please let me know if I need to supply any further information.