Why does LabVIEW sometimes hang when DLL loads into memory?

I'm calling a third party DLL from LabVIEW 2010. LV occassionally hangs (Not Responding) when either loading the DLL into memory or when closing my main VI. When it doesn't hang, it communicates with the DLL seamlessly. When I try to build an Application (exe), LV always hangs during the build at the point that it is saving the main VI (the scroll on the builder moves until it says "Saving main.vi"). Any insight into what needs to be done to the DLL (or VI) to resolve this issue?

What does the DLL do? One cause of this could be to try to load/unload other DLLs in PROCESS_ATTACH or PROCESS_DETACH of DLLMain. Microsoft has in many places said that doing this is highly unsafe and asking for all kinds of troubles, since the DLL loading is not fully reentrant.
Another possibility would be incorporation of ActiveX components that use some form of RPC mechanisme to communicate with out of process ActiveX/OLE components. The necessary RPC proxy hooks into the calling processes message loop and that is a delicate piece of code in LabVIEW. Even when the DLL does not use ActiveX itself, it might employ some message hooking on its own and mess up things in a way that Windows and/or LabVIEW get confused.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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