Why am I being asked to log in to upvote a question, but am then told I'm already logged in.

Question

I have just tried to upvote a question on G2G but was told I need to log in to use voting. However when I click the log-in link, it tells me I'm already logged in, so I can't use the voting. Can anybody tell me how can I solve this?

Comments

I've been working on profiles for the last 3 hours so I'm pretty sure I'm logged in but G2G doesn't think I am. I've never had this problem before and it's very annoying. I have to do Capchas every time I want to comment.

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I'd close this question now I've sorted it myself but I've no idea how, lol, since I was anonymised when I wrote it.

Answer 1

I just tried logging in on Chrome and it worked fine, so the problem must be with the Firefox browser.

Comments

OK so I had to look up how to clear cookies for just the one site (Wikitree), then log in worked fine.