Pete, I did all that you said before I made my first post including removing a few panel addons. First I would like to thank you for this excellent module. As my sim works really well with version 3.22, I am quite happy to continue with that.
I also deleted the FS9.cfg file so that it would be rebuilt on start up. This cured the problem initially so at least the sim ran for a couple of minutes instead of crashing as I opened the GPS window.
I completed a 2Hr flight on the 3.22 version with none of my original set up changed (original modules etc), so there can only be a conflict with 3.30 somewhere.
I would not worry about this unless someone else reports the same problem (hence posting here), since it may be a problem with something I have done or added.
Regards Nitram (Martin)