Well, I thought it might involve a fix like this; however, I don't know if I now have an 8.5 version of RTwatchdog.llb or an 8.6 version. Was RTwatchdog updated between the 8.6 and 8.5 releases? The date on my RTwatchdog.llb file is 3/3/2008, so I'm thinking it's the 8.5 version. So if I create a palette that's linked to the RTwatchdog.llb that I have, will the features work correctly in 8.6? At the PXI controller end, I'm probably OK because the latest update of NI-DAQ did not update the version of NI-Watchdog (it stayed at 2.2.0), but I'm not 100% sure about the host end.
By the way, I did go ahead and create a service request on this: SR#7212307.