Edit - Create SubVI results in error "an input parameter is invalid [...] cannot save VI"

I get this error with some frequency. I select a bunch of my block diagram, create a subVI only to find that it is unsaveable. Here are the steps I take to reproduce this:
Select a portion of code
Edit -> Create SubVI
open the new subVI
try to save it and this message pops up (without showing the Save dialog)
I get past this by saving a snippet and making a new VI.
I'm using LabVIEW 2012 on Windows XP, but I had it happen with LabVIEW 2011 as well.
I read through this thread, but it's not the same situation because my message doesn't have an associated error code. No variation of "Save As" has any effect, either.
Has anyone else seen this behavior? Have you any suggestions to help me resolve it?
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice

Greetings, Jim;
I see the error happens with some frequency, is there anything that seems to bring that error to light or does it just seem to happen randomly when saving to a SubVI? That is to say, does it seem to happen when you are using/saving a particular set of VI's or a module or some such, or completely haphazardly? Is there any hardware that you are attempting to connect to in that VI as well?
If you try to save the SubVI and get that error, can you simply save the main VI again without a problem? Finally, you have also seen this behaviour in 2011, did it happen with similar frequency?
Cordially;
Simon P.
National Instruments
Applications Engineer

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[cid:[email protected]]
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[cid:[email protected]]
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