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Usually when that happens, you can hit the back button and then reopen the reply box. If you're using Chrome or Firefox, your comment should be cached (I'm not familiar with other browsers, so I don't know). This works. Usually. Not always. I've learned this lesson too many times, and I now always copy before I submit for anything longer than a sentence. If you develop this habit, your frustration level with Hubski will be diminished tenfold I promise.