Ok, it seems that your problems were due mainly to the length of your usernames. Our system was cutting them off at 20chars. We will update them to the limits set by POSIX standards, 32chars and matching the regex ^[a-z][-a-z0-9]*\$.

Just a quick update, sysadmins have been digging into your api logs and we see a number of the errors you ran into. We are chasing them down now.

Thanks for reporting. I've added the missing strings, they will be in the next Dashboard release (currently in QA). For now you can start translating them though: https://premium.wpmudev.org/translate/projects/wpmudev/nl/default/

I'm really sorry for your trouble. Out of 700 sites right now we only encountered issues similar to yours on 3 sites (the other 2 belonging to staff). These had various root causes and were specific to the unique nature of those sites and their traffic levels. Thank you for your help in identifying those, however painful it may have been. We've deployed a few fixes to all sites, and there are two other possible root causes we are currently still addressing. I hope you will be open to giving us a try again in a few weeks (of course with the temporary domain) once we're confident those are ok.

We had a bug that was sending invalid emails internally, and that used up the daily email limit for some sites. The limit should be reset by now for you, please let us know if not.

That's just the alt text that shows when no data has been recorded yet (site has not been visited). We have to figure out how to hide that until it's ready.

Just for future reference if anyone comes across this, if your domain registrar does not provide DNS hosting (most do) then you can get free DNS hosting via Cloudflare (in addition to all their other cool security/performance tools) which is one of the fastest and most reliable out there.

Backup documentation is finished, let us know if anything is unclear: https://premium.wpmudev.org/docs/hosting/backups/

That sounds like a job for the Coming soon/Maintenance mode module of our Ultimate Branding plugin!

It appears that there was a snapshot running at the time, and your server ran out of memory. We are making some optimizations currently to prevent that as much as possible.