Sub VI only works if nothing in call chain is a dialog.

[paul_cardinale]

Open Main.vi and run it.  It works OK.

Open its VI Properties and change its window appearance to "Dialog".

Now it won't work.

[paul_cardinale]

Being modal causes the problem.

[Bob_Schor]

Could it be the "Interactive" node on your "Open LV Document" script call in "Get all errors" sub-VI?  The Help says if this is True, "LabVIEW may display dialog boxes ..."

Bob Schor

[paul_cardinale]

It's actually the 2nd invoke node: "GetActiveVIRef".  I want to get a reference to the VI just opened, but if something is modal or floating, the Active VI ref isn't to the VI just opened.

[Yamaeda]

I'm guessing a modal window is always active, so either use some other tag than active, or temporarily unset the modal flag.

[paul_cardinale]

I ended up having to cheat by snatching the contents of "Error Ring.xnode:Get All Errors In Family.vi" (if course what I had been trying to do was also cheating).