Hi all.   I picked up this fine aircraft during the sale.   I've had some nice flights with it so far, seen a quirk or two, but very much enjoying it. 

I am having trouble getting it to do an RNAV approach.   I go through the process of selecting one of the RNAV approaches in the FMC (I have latest Navigraph installed), select a transition, and execute.   But when I go back to LEGS, there are no waypoints added for the approach.   This seems to be the case at any airport I have tried it with.

Then last night I tried manually entering the waypoints for RNAV 17R at KCOS, including the speed and ALT restrictions.   The plane flew it OK for a couple of waypoints, but then as it went to make a turn, it stopped honoring the ALT restrictions and we were going to become a lawn dart before I took control and flew the rest of the approach visually. 

Is there something I might be missing here, or is this a known issue?