This is with out any sort of filters set up, all default settings.
If I just click on any of the first servers to load that are available I can join and play no problems.
One thing that has seemed to help has been to go into the filters and select minimum players to 1, I haven't had a chance to let it sit and test if that makes it stable or if it just takes longer to become frozen.
The other thing that I noticed is that some of the other options in the filters are not working as expected if at all. For example setting minimum ping, I still get some servers with "?". I'll test more tonight when I have a chance.
This happens on the standard beta and the dev build. Currently I am playing the dev.