Hello Andreasl, Thank you for contacting National Instruments.
Please try the steps listed in the following Knowledge Base: http://digital.ni.com/public.nsf/websearch/705C2ECA081F3C7986256C0F00559B02?OpenDocument Make sure all sub-VIs are working properly. Your main VI might run correctly even with a broken sub-VI if the broken VI is not called. Let me know if this does not help. Sean C. Applications Engineer National Instruments
