It seems to me that quite a few options don't work ,using XP10 latest beta number, I keep trying to press the FPL button no effect, on/off, and a few others. Is this normal?

unfortunately yes. It is the basic default X-Plane GPS wich lacks a lot of options. Take a look at this one (freeware):http://www.eadt.eu/index.php?kln90b

The is only one word to describe the default XPX GPS and it starts with S and ends in T, however there is a very good freeware GNS 530 that is a very good considering it is free, it doesn't put the realityXP gauge to shame by any means but at least it works in XPX and that cannot be said for the RealityXP gauge. If you have the Garmin Trainer installed already because you have the RXP gauge in FSX or FS9 then it really is simple to install this package in XP, just drop the folder into the plugins folder and follow the simple instructions to get it to display in the sim.http://forums.x-plane.org/index.php?app=downloads&showfile=9620