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P3D v4 taxi out plane goes no further

traffic tools shows pre taxi out. planes back up, engines running, and then they just there and they do not proceed. ade fault finder shows no faults. ade showed closed rwy, but I fixed that. Now no faults. Regardless, should I just redo the rwy? any other ideas?
I am finding out just now that there is something wrong with the planes. checking for fs9 crap. I subbed the bi-plane for a cessna 172. It is working. ERGO- de planes, de planes!
I donwloaded and installed another bi-plane. It does the same thing. Are biplanes not functional n traffic files?
Biplanes are perfectly functional if they're correctly coded for the sim you're using. However, many AI legacy aircraft that you may be using were originally coded for FS9 and may well not work well in later sims - at least, not without some work.

If your biplanes are (or were) military, there's a good chance than an FSX or P3D version has been coded and made available at MAIW. Also, several were included in the freeware Orbx Australasia AI pack, and many of those are ex-MAIW products updated for P3Dv4+. If re-sourcing your models from those places doesn't or can't work, you can try a conversion of the .mdl file in MCX. If that also fails, you may need a new .air file from the developer.