Problem: Selecting new theme = Bonk
Fresh installation. That is to say that the only thing I've done to a brand new installation is add 1 theme (downloaded and unzipped). When choosing that or either of the 2 installed/default themes, the main site goes "bonk". Clicking preview creates an immediate "bonk", and while going back one page shows the admin site again, it has the preview widget in the corner and the main site goes "bonk".
It's clear that I missed a setting somewhere that's creating this problem. Any ideas?