I know about the vendor files, and it's not an OS problem (that part works #1 as usual), but an apps that is too old. Telenav said that my version of GPS Navigator from Bell Mobility isn't compatible with 7.1.xxx
But I found a solution : I did an upgrade using AT&T Navigator wich is newer and works with 7.1.xxx, but sadly I can't keep it because my provider (Bell Mobility) doesn't allow AT&T Nav to connect to their servers. Only on Wifi. So, then, I deleted AT&T Nav, re-install GPS Nav from Bell, and woot ! It works perfectly ! I dunno why, but it works now.
