Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
I've only just installed Vanilla after discovering it earlier this morning.
It all seems good but after enabling one of the other built in themes (the embed safe one) I started getting a Bonk page. I changed it back to the default theme but I still get the bonk page. If I clear the cache to sign out, it works find, so it's only happening when I've logged in.
Also, because I cleared my browser history, I can't work out the address to get back into dashboard because, the bonk page doesn't have the dashboard button.