maybe there's some interference between data connection and GPS here, with Bell too, in the same style as in:
New Official rom & live & gps bug.
http://forum.ppcgeeks.com/showthread.php?t=33784&page=4
???
P.S. from that thread:
"Just a update. Apparently disabling everything that makes your vouge have a auto data connection fixes agps. I opened up my explorer to connect to edvo and tried the gps and guess what. Agps works. So manualy connecting to edvo does Not kIll agps."