Have looked at the offending profiles on the DS and can't see why they don't work when others do. It might be nginx I guess but I don't see how. Let me see if Brian has any suggestions.
Iirc Vimeo didn't provide category in their video data which is why I did include it when developing the module. If that wasn't the case, or they are doing it now then yes, we can add it in.
The Private Note module will allow your users to send messages to each other, and those users can select to be notified by email when they have received a message.
Is that what you need, or are you asking for something else?
Can't say I've ever had an issue with this. I leave computers on and am logged in for days/weeks. I also regularly login as admin on user sites the same time as the owner when helping them so that we can walk through the same pages whilst talking on Skype and have never had issues. Are you still unable to log in?