OK so...heard great things about this plugin so wanted to try it.
First of all, let me establish that there's a reasonable chance that I'm an idiot. So bear that in mind.
Running my stuff on a Windows server. When I installed this plugin and went to do it's settings as described, I got a message saying that it couldn't write to the WP config file, and it asked me to add the WP_Cache switch to said config file. Which I did.
I figured that message would go away once it I put that line in the file and saved it. But it's on every page of the plugin settings as I meander about.
Also, after saving the changes the site doesn't load right anymore (using lightly modified Twenty Eleven theme). Menu bar didn't work and whatnot, etc.
So I deactivated the plugin for now, and the site works OK again. Any thoughts for me?