Problem with sending a message

Am having a problem with sending a question (as a buyer) and a message (as a seller) on ebay. It must be my computer but if someone could tell me how to fix this I would be grateful.  The box comes up but I can't put a question or message in - it only shows my user name.  Very frustrating both as a seller and buyer. Hope you can help. Thanks.

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Try clearing cache and cookies, and if you are not already using Firefox or Chrome as your browser try that, they are much more eBay friendly.