Fusion Thread milling failed to post a usable code

Hey there peoples. I'm trying to get thread milling to work on a fagor 8055M vertical milling machine. I have managed to get an1/8 npt thread milling program to work from the 2D thread cycle. But for some reason if I switch the thread size to a 3/8-16 UNC thread the fagor mill tells me "circular interpolation impossible ". I'm using the Fagor for milling post processor from autodesks webpage. Also if I use the threadmilling drilling cycle the mill dwells for a second or so every half rotation in the thread bote, this is rather undesirable because it destroys the thread. I found out that if I turn off smothering the 2d thread cycle will work , but it changes to the same jerky movement as the thread milling drilling cycle.

Any ideas on how to fix this problem with the straight threads not posting a usable code?