Peter,
Thank you for pointing me in that direction. A forum search would've been smart I see, my bad!
I'll try the suggested use of Boundary Surface in schedules, it seems the most helpful fix for my deadline of upcoming monday.
I'm not one to ussually moan about ArchiCAD, but how this bug survived over 2 updates is a bit mindboggling.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5