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I need help

What is happening to my account, I really dont understand. I try replying to other peoples post and when I click 'quick reply' a page opens up saying I cant reply coz I either not logged in, or the my account may have been disabled.
Its annoying me a lot because I was replying to one of the post, i wrote so much and when I clicked 'reply' the same page came up and I couldn't reply
Does anyone understand what is happening?
Im actually surprised I can post because before I couldn't post anything either