How do I clear IMAQ 1394 Occurences?

I am trying to use the IMAQ1394 Occurence Config to generate occurences to control the timing for my imaging acquisition. I've followed the example "Low-Level Grab Async.vi" in the IMAQ1394 examples library, and I have successfully generated occurences to control a low-level continuous grab. When I stop the grab with IMAQ Stop Acquisition, and then try to restart the acquistition with IMAQ1294 Start, the occurence no longer works. I am not able to clear the occurence, and I cannot create a new one. Do I have to close the session and restart it in order for the occurences to work again?

I'm trying to understand the sequence of commands you did. Is it as per the attached vi? it should work.
Do you see an error code/message?
Attachments:
LL_Occurrence_Ring.vi ‏113 KB

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