I'm at GE 4.0.15.0 and my 910XT has not sync'ed since 4/18. GE often shows no errors after a sync. I've removed and readded the device. I've deleted much of the history (even though only 22% memory used). I've set all activities to transfer. If I get a GE error, it's not able to communicate with GC. The ANT Stick is recognized by the Win 7 computer. Win restart has been attempted.
GE is now asking for my GC ID & password after each sync. Didn't used to do that.
I've read the posts about the sync button going away. That's crap. Just like this software. Autodetect can take a long time.
While writing this, I installed GE 4.0.17. Still crap.