Greetings,
The autopilot limitations comes from the autopilot manfacturer, not the
GPS at this point. Apparently the TSOs for the GA autopilots were not
designed or flight tested for LNAV/VNAV and LPV approaches. I expect
these problems to be resolved in the near future so we can let 'George'
fly to minimums with the GPS and be able to snooze just a wee bit
longer.

Mike, two questions: Were either of those GPS approaches flown coupled?
What is the date and version of your GNS480 (or CNX80) software?
Fly SAFE!
Jedi Nein