PXI-5102 Slave Fails to Trigger

[VI_Joe]

I'm synchronizing two PXI-5102 Digitizers using LabVIEW 8.2, Traditional DAQ, & niScope.  My VI is a modified version of LabVIEW example "niScope EX 5102 Synchronization.vi".  I'm edge triggering the master 5102 and digital triggering the slave over the RTSI 4 bus just like in the example.  Most of the time, everything works fine.  But occasionally, the master digitizer triggers on an edge like it's supposed to, but I get LabVIEW error -1074126845 from the slave digitizer which makes me think the slave is not triggering.  Also the slave's waveforms aren't present on the graph.  This is different from traces with zero amplitude.  When I get the error mentioned above, the waveform from the slave is missing.  Can anyone explain and/or offer a solution?

[Tarek]

This error does imply that the slave is not triggering. It could be that it's not armed when the trigger arrives. I do not know why this might happen, but it could be helpful if you can post your code here.

Also, is there a specific reason why you're not using DAQmx instead of TDAQ for your application?