I recently uploaded to 4.0.23 and when i did so my forerunner no longer synced with expess, mainly got repeated attempts and error messages stating the the sync with garmin connect failed. it acutally did work once, but then started failing again. I removed the device from express and then when i try to re-add it attempts and then states that the pairing failed and that my device should have asked me to accept yes to pair (pairing was enabled on my device). Not sure what to do now.. pretty frustrated. updated to 4.0.24 but don't have much hope of that working
