Building a shared library breaks VI synchronization

Hello.  I am running LabView 8.2 with an ELVIS (with a 6062E DAQ card) I am creating a VI that is to control multiple elements of the NI ELVIS that must be called from a .NET program.  Specifically, I need to find a way to synchronize the Arbitrary Waveform Generator and Oscilloscope modules on the ELVIS (I want to generate a waveform and observe it through the scope).  I have been able to do this from within LabView (by using a rendezvous object to roughly syncronize the two operations in software and setting a hardware clock to trigger both modules).  Problem is that this synchronization breaks when I build the lab view project to a shared library and call it from a .NET library (using PInvoke).  When run from the .NET library, all parts execute but the Arbitrary Waveform Generator appears to run after the Oscilloscope completes reading (observed using a separate scope).  I've confirmed that the inputs to the VI are being properly handled by the .NET code and interpreted by my VI.  I've confirmed that the scope channel does actually read data when run from the .NET library (ran a power supply line to the scope channel and got the right voltage readings back).  I've tried adjusting the frequency of the trigger clock (on the theory that the waveform generator was lagging the scope for less than my initial clock cycle) and do not observe any portion of the waveform via the ELVIS's scope.  Initially I was running the waveform generator in a separate LabView thread from the main program flow, which included the scope.  I have also tried restructuring the VI such that the waveform generator is in the main program flow (branching the error object line just before the rendezvous object for both the scope and the waveform generator).  Both approaches yield the same response.  Running directly in LabView leads to a correct syncronization, building the VI into a DLL and running from .NET does not.  Has anyone seen anything like this?  Thanks in advance for your help.  I'm quickly starting to run out of ideas.
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