confused about logging in and out

I signed up many months ago directly from e-mail and more recently accessed the site via Facebook. Now my account is messed up. Can’t log out, it seems. Not even sure whether I’m being recognized inside the site. Not only that, but I’d like to change my Facebook password. How will that affect my account?

When I try to log out, I get an alert saying “session mismatch”

You should try to clear up your browsers cache.

Thanks for your reply. I’ll check it out. I’m sure there must be thousands of entries in it.

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