David,
it actually does not matter wether I use the stretch or move command. It all yields the same result. As I mentioned before, it does not happen all the time. This happens to any window or object that can be stretched via hotspot in 3D (i.e. Steal Beam) after I work in the file for a certain amount of time. It seems like the file is getting corrupted while working on it.
The very weird part is, that if I save the file in that state and restart ArchiCAD it is working fine again.
Here is a screenshot from this am after a fresh start on the file, and it is working just fine. I would bet my house that by the end of the day, it will be as the previous screen shot.
The object in this case is 'W Storefront 3 14', so nothing special. And yes, I have loaded the 14 library into a 15 file. This file was originally started in 14, so do you think that is causing the issue?