Why does Labview hang when switching from one TestStand application to another?

I have several 2013 TestStand applications that use a number of LabView 2013 VIs on a test computer. When the operator closes one TestStand program and opens another often Labview does not close properly and so when TestStand tries to load the LabView VIs it hangs or just runs and every test that is affected by LabView fails. The only potential issues that I know about are that two of the applications were created in LabView 2009 and then updated to 2013. Then two other TestStand applications that were created in 2013 use the function "UnloadAllModules".
Are there any known issues with LabView 2013 that cause this or any ideas of what I might be doing wrong?
Solved!
Go to Solution.

Hello Michael,
I did find my issue. In my case a VI was not getting closed properly in cleanup due to the previous command not passing the handler out correctly. Thus this VI would remain open and when I ran another TestStand Sequence, when it tried to load that LabView VI it would just hang. But the result of this error could be seen when I closed TestStand and LabView stayed open (since it was frozen) or when done running the sequence and closing it. Then if you tried to pop-up LabView it would not show the starting splash screen because it had froze.
I found the problem by turning on the show VI front panel option in TestStand for all of the VI calls. The VI that stayed open was the problem VI.
Thanks everyone who responded for your help!
Kurtus

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