[Plugin: WP-PostRatings] How to make it work with w3 total cache

I think you have to exclude the plugin’s java / ajax files from the minify feature. Or disable Minify entirely. (This is not a professional answer, its a suggestion only).

Did the WP Post Ratings author explain how the plugin should work with caching?

Referring to the author’s website forum, there is information on how to make WP-PostRatings work with WP-SuperCache. This might be helpful.

http://forums.lesterchan.net/index.php?topic=4281.0