Greg,
No I haven't tried reloading an old version, even though I have them on the HD. If I find other anomolies, I'll probably try that. One thing that may be triggering it, is getting a gps fix in the middle of setting up the different parameters. I do my S/W loads on a portable unit (good 12V source), inside the house. Once the S/W is loaded, I reboot, and start setting up parameters ASAP. In the meantime, the unit is trying to establish a gps position, but takes a little while given only using the internal receiver, within the house. Right now, that is only a hunch.
I'm hoping HB is providing at least one more release for the 798ci that will include the advertised 2012 features. When I load that, I'll let in get gps position fix before changing parameters.