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So I filed a service request on this and NI has been helpful but I haven't managed to resolve it yet, so I'll post what I know here and maybe someone will have an answer. It appears from talking to NI that this may have been resolved in 2011. Currently I am using 2010 SP1, 32bit on Windows 7. Upgrading to 2011 may not be option. I'm looking into that. Here is how I noticed the issue: I was trying to deploy and run some code on an RT target. When I deployed the code it asked me to save a particular lvclass file. I hadn't changed the class, so I'm not sure why it wanted to save it. I clicked ok to save and got into this endless loop where it kept asking me to save it. Clicking cancel got me out of the loop, but then I couldn't deploy the app. I thought maybe the class was corrupted so I tried to mass compile it and I got the following error: Fatal Internal Error at OMUDclasslinker.cpp line 4161. I tried running the same code not on RT but within the regular LabVIEW environment and it ran fine. I also noticed that: The save-all button is always enabled and everytime I click it and click on the show details button, it says that there have been changes to this particular class as well as its parent, even though I haven't changed anything. When I click save, this time I get no error, but afterwards the saveall button is still enabled. And the next time I click it the same thing happens. Anyone have any thoughts?