IFX gets confused, wrong constrains after placing sunken screw

We started using IFX about a year ago and since then I have been improving and adding bolts and nuts to it. After some minor hiccups during the implementation, it works almost perfectly. All models are family table instances.

But now a strange issue has turned up:

1. After placing a sunken screw, which we don't use a lot (SCREWTYPE 60), all next screws (Hexagon, Cylinder head...) are placed "in" the material. The preview shows it already and, the distance constraint of the screw shows a strange value I do not recognize. 

1. Accidentally I found out that the "issue" was solved by once selecting the Coach bolt. It is not even necessary to place the Coach bolt, but only selecting it from the menu, and then selecting the desired bolt solves the issue and brings the system back to its normal state. When investigating I found out that for the Coach bolt I used the "non existend" SCREWTYPE 92. But it works fine!