Why won't Firefox let me add an exception?

Firefox tells me that a site has an invalid security certificate, which I know. It asks if I want to Add an Exception and I click to add one. It pops up the Add Security Exception window and that window tells me that this site has a valid certificate and there is no need to add an exception; but I DO need to add an exception and it won't do it for me. Why?
I am working in a secure test lab and use Firefox to login to our systems under test. Each time we change or add hardware we must add exceptions to login to a system. I have done this for years with Firefox but now Firefox 4 seems confused. We now need to use EI, which I would rather not.

I use a lot of equipment with internal (untrusted/self-signed) certificates and I face this problem one or two times a month. This has been going on since FF 4.0 came out and has continued with v5 and v6. I know someone said nothing has changed with regard to cert handling - you are wrong.
This issue is nearly crippling to me and is driving me away from FF entirely. Were it not for a couple irreplaceable plugins I use, I would already be gone. No other modern browser is as irritating WRT the handling of untrusted SSL certificates as firefox is, and no other modern browser has a problem like this. I'm facing this issue right now with a system that I *need* to be able to access, and I simply cannot use FF to do so because of this infuriating issue.

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