I've been having lots of problems connecting my phone with the Desktop Manager. I have the BlackBerry 8320 (T-Mobile), v 4.2.2.180, and am using Desktop Manager 4.3.0.17 on my laptop (Vista).
Initial BT connection takes about 12 seconds (for the DM to ask if I want to connect by BT). After I click "Yes", it takes another 3 seconds to 1+ minute (huge range, and that's if it even connects) for the phone to actually show up as connected in the lower left corner of the DM (but the DM knows the phone is there, because using the "detect" option always sees the phone). The phone, meanwhile, gives the connected BT symbol on the screen.
If I'm lucky, I can sync my phone. Often, it'll disconnect and I'll have to turn off the BT radio, close the DM on my laptop, and try it all over again. I've found that turning off the Wi-fi & mobile connection seems to help, but not always. Very inconsistent.
And even if I am successful syncing my phone, I've been consistently having problems backing up my phone via BT. For whatever reason, the connection drops (DM says there is nothing connected, though the phone continues to show the BT connected icon). It doesn't matter if I just did a successful sync or if backing up is the first thing I try.
It's very frustrating.
Oh, and I've had no problems using BT with my handsfree so far (Motorola speakerphone that you clip on to the visor). It's just a problem connecting to my laptop.
No GPS on my phone, so no issues with that.
If anyone has any suggestions, I'd be glad to hear it. I had no problems at all with my Pearl (using 4.2.0.64 on the handheld; 4.2.1.107 was buggy on my Pearl) and DM v. 4.2.2.14. It's just the Curve and this newer software, it seems.