OK, here are two suggestions.
First, please go back to the original line spacing. II find this one hard to read.
Second, please send out a message to everyone about this and not relyinstead of relying on the Meta sidebar to announce it. II actually thought my browser had screwed up or I changed an option somewhere. I tried different browsers, rebooted my machine, etc. and then decided to search Stack Overflow. All because I could not imagine that something like this would occur without a major announcement. Doing this will prevent others from wasting their time troubleshooting.