Sorry, nobody has ever reported this problem. They work just fine here.
Those we reported it, were only complaining about the visual *range* of the signs, which resulted in disappearing lines at wide zoom levels only, but everybody had the taxilines at zoom levels of 0.80 and above. The 1.0.5 just increased the loading range so, the lines appears at zoom levels of 0.30-0.40 and above.
If you don't have any taxilines at all, at any zoom level and regardless of the mesh setting, than it's not a problem of the scenery, but it's most likely another scenery in conflict.
If it's another AFCAD, probably coming with an AI traffic package, you can use the free FSX Airport Scanner available here, to look for duplicate AFCADs for KDFW.
http://www.scruffyduckscenery.co.uk/ (click the "Download Center" link )