wyethia on "WP Super Cache Timestamp Problem"

I have the same issue. Pingdom says the cache is not working and the test shows

" Timestamps differ or were not found!"
Fetching http://www.sptrfa.org/ to prime cache: OK
Fetching first copy OK (1.html)
Fetching second copy OK (2.html)
The pages do not match! Timestamps differ or were not found!

I don't see any timestamp at the bottom of the html source code

Don't know where to go next...