OK, so you are saying that DAQFactory stops responding, but the rest of windows is still running. This could be caused by some problems in your document. Can you please attach your .ctl document so we can review? If you don't want to make it publically available, go to www.azeotech.com and the contact page and post it their so it goes direct to us. We no longer post email addresses because of spam crawlers (which has gotten horrific, as I'm sure you know), which is the only reason I'm not simply giving you my email address here.