I also had this problem but managed to fix it.
This is what I did and it may work for you.
1) Set the correct TCP settings
2) download and install google maps
3) delete your Desktop [IPPP] service book (you can always undelete it if necessesary).
4) pull the battery for a minute
And after that it worked. I deleted the service book after reading the following article.
FORTUNE: Techland How to get the Blackberry Facebook app to work «
Hope that helps.