Has quit working

I have loved this plugin until now. I quit working with the update to 3.5.1. Now my site is very slow and the test shows these failures. Please help:-)

TEST INFORMATION SHOWN BELOW:
Cache Tester

Test your cached website by clicking the test button below.

Fetching http://mysite.com/ to prime cache: OK

Fetching first copy of http://mysite.com/: FAILED

Fetching second copy of http://mysite.com/: FAILED

One or more page requests failed:

The pages do not match! Timestamps differ or were not found!

http://wordpress.org/extend/plugins/wp-super-cache/