Why do my internet filters quit working on one of my three computers when both computers are identical?

I have three computers with identical software, versions of Firefox (18.0.1), and identical in extensions. However for some reason, on just the one computer my content filters (ProCon and Blocksi) are no longer working. They're enabled. I've cleared cache and cookies. I've restarted Firefox 5 times already. I've used Google. All to no avail.

I've disabled all extensions but one the ones that don't work. Still nothing. They work perfectly on the other two. But on this one they just suddenly stop doing their job.

So what do I do? Does this make sense? Is there something on that shouldn't be that I am unaware of? I have a feeling the answer is something simple that I missed.

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