A few days ago I released a new version of the apps (8.0 / 9.0) fixing issues due to updates to the garmin connect websites.
Unfortunately those changes were just the beginning, and more have come, and the app is not working again. I know it's not pretty, but it's also not something I can control. I have to analyze the new protocol and come up with a fix. Again, I know you would like an ETA but reverse engineering is not an exact science.
If you have purchased the app in the past few days and you feel outraged, feel free to contact me for a refund (I'll need your order number). If you feel like you need to go and downrate the app on google play, go ahead: some people need to be on the left side of the IQ bell, so if that's your role I won't try to stop you.
Please follow sportablet on twitter or facebook for updates. I need to focus on the fix. Thanks.