When trying to upload from my Forerunner 305 using either Firefox 3.0.10 or IE8.0 the activities are successfully read, but nothing appears in the list until another tab is clicked within the website. At that point, the activity list briefly appears then disappears. I have not been able to upload to GC in about a week yet MotionBased continues to perform acceptably.
So you're going here - http://connect.garmin.com/activities Maybe you have some sort of popup blocking going on? OTOH, same issue in IE8 and FF. Can you try on a different computer?
Forerunner 305 doesn't upload to Mac - activities disappear
After installing the latest communicator plug-in on a Mac (Intel Macbook Pro running 10.5.7) and Firefox 3.0.11, the activities read successfully from my Forerunner 305, but a blank new activities list results (regardless of uploading new activities or from a list) until I click on another tab. The activity list then appears momentarily then disappears. This now happens on my Vista based PC and Mac!