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I had the same weird thing with the dialog disappearing - my solution was to throw together this little VI to recursively set the property on all VIs in a folder - it's a little quick and dirty but does the trick Mark as Source Only.vi

I haven't had stability problems with LV 2010, but I've only just started using it. (I'm hoping it is ok, because I for one would really like to get a functional Suspend When Called again!) This "silent crashing" behavior started with LV 2009, and boy is it irritating. We eventually traced one cause of this to an excessively long type descriptor inside a class, but it was very difficult to track it down because of the total absence of failure logs.