Hi all. Thanks for your patience on this. We have an imperfect temporary fix that'll get people playing again. I won't bore you with the details of the problem (and in no way is that management speak for 'I don't understand the problems well enough to explain them to you'), but basically we're bumping into a limitation when there are more than 50 lobbies that include Dedicated Servers.
Our fix – which is a quickie, designed to get things moving – removes Dedicated Servers from the 'ALL' lobby filter, which is the default filter. With DS removed, you'll be able to enter lobbies as normal. You can switch to filter Dedicated Servers, and enter them correctly, too.
HOWEVER. If you switch from filtering Dedicated Servers to filtering 'ALL' (which will only be P2P under the fix) or 'P2P', you'll have to restart the game. Each time you switch away from P2P/ALL to DS, and then back again, you'll need to restart. It's not elegant, but it'll get the vast majority of people up and running quickly. Proper fix incoming next week.
We're building at the moment. We'll need to test, to make sure that everything work's as it should, and then we'll push out to Steam. We should have it all done – touch wood, fingers crossed – inside the next hour or so. Which is still Launch Day, right? At least, it is where I'm sitting.
Thanks for your patience and support, you lovely people!