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?