I can't edit my activities in Garmin Connect

My only solution: change VPN to US (I am from Poland) and it works fine.
Before W7, W8 and Android (chrome, FF and IE) can not edit any activity.

Hi, I also have same issues as you describe. I can edit title and add text comments but "full edit" to for instance add temperature data or adjust distance does not work. I tried to switch from "modern" to "classic" view but this does not help. The full edit in classic view appears to be disabled. In modern view it just fails to load like you describe from you Java console diagnostics. I use a MAC with latest OS-X Yosemite and Safari 8.0.2. I also tried Google Chrome Canary but have exactly same issues there.
/Richard Olivecrona

same here, since a week or so. Classic and modern view, both corrupt.

Just received an 'official' reply from Garmin (translated from Dutch).

"Thanks for your e-mail.
Regular updates are performed on Garmin Connect.
These can cause temporary problems.
I can only advise you to check again regularly."

Not a big help since these 'temporary' problems keep showing up for several days already :-(

Well, not much help. I've discovered that the same problem appears when I try to add a manual activity, but that works in the classic interface. Weired.

There are a few ongoing issues with Connect Modern right now. The advice to 'check back' regularly is probably as good as you'll get at the moment.

Back to the old error on validation_en.properties not found. I guess it would be better if I'd try in Thai or in Chinese...

This now seems to be fixed, it's working for me anyway.

Yes, working OK for me. Still some Javascript errors thou...