anyone's MM stopped working?

i have upgraded my N800 to OS2008.
both MM and Navicore seemed to work fine. then for some reason it would not start. (i think, but not sure, that it happened after i configured GPS receiver under OS Settings. I use Nokia gps receiver)

so i uninstalled Map (wayfinder), and uninstalled/reinstalled MM and Navicore multiple times and neither want to start. (once i reinstall it, i click on application, but nothing happens)

any ideas? do i need to reinstall OS again?
thanks a bucket.