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Sorry, I should have updated this thread ages ago.

I found that the problem in my case was due to an incompatibility with an advertising plugin I was using. I removed that plugin and went back to using Wp Insert to manage the ads. I now have NoSpamNX working happily with W3 Total Cache, including HTML, Javascript, and CSS minification.

Sven, I love your plugin. I only get something in my spam queue once a week or so. The plugin reports that it blocks about 100 bots a day. Thanks for making a great plugin.