I was afraid... If you don't mind to send me a screen capture of your installed programs list (Control Panel/Add or Remove Programs), please do it (email address below). I might find an other pattern, however, I'm not so confident now of this possibi...

Dear All, Those of you who experienced this problem, please tell me if McAfee Viruscan is installed on your computers or not. It seems that ArchiCAD 8.1 conflicts with an other running program, and the data I collected so far suggest McAfee Virusscan...