Archicad crashes when changing input method in curtain wall

[Achille Pavlidis]

I have created a curtain wall with the Boundary Geometry method. When i open it in 3d to edit it, i find it impossible to select the frames.
When opening the geometry method window, the minute i click on the "Input method: Grid" button, Archicad crashes.

p.s. I'm working on Teamwork, if this is relevant.