Updated to 2.6.4 and all projects are 'Null'

I just updated to version 2.6.4, and when I went in to the app to work on my sites, all I have are a black screen, with a dark grey bar that says “Null”. Any idea what happened to my projects, or how to get them back? Thanks!

That sounds very strange. Can you access the same project through Time Machine from before you installed 2.6.4 and try it again? You could also use Time Machine to recover an older version of Blocs, but obviously none of this should be happening.