I have the same problem – internet is working (erm, I'm posting this!) but Avenue 7 cannot connect to the Internet... it's now disabled my licence, I cannot unregister it (no internet, it says) so can't do offline registration... the update function also doesn't work.
I've unregistered it on the website, but that has no effect in the app (because of supposed lack of internet).
Attached is a screen grab of my ping to resolume.com
Seriously – I cannot complete a job at the moment, thumbs-down to this system, basically.