I used I/O Trace to capture what is going on with the initialize function. The error is occuring in IviFgen_InitWithOptions which is corroborates my earlier debugging. The error occurs after the call to the C library (Call Library Function Node).
I was now able to try the Initialize -> Close LabVIEW code with another 33500B series function generator (model 33522B) and it fails at the same point. But, instead of error -1073807339, I get error -1073807343 ("Insufficent location information or the device resource is not present in the system.") even though everything is correct in MAX and I can communicate with the instrument using VISA commands.
Attached files: vi2.png is the LabVIEW code I'm running. Capture1.png is the I/O Trace for the first function generator I tried (model 33519B-- the one with the timeout error). Capture2.png is the I/O Trace for the second function generator described in the paragraph above.
Thanks.
