Preview shows an empty post

I tried to post something on the Windows forum but when I clicked Preview it showed up blank. The length of characters displayed next to the preview button (where it says max=8192) even remained 0 despite having typed into the content box. It even says 0 on this post. What could I do to prevent posts from being blank?
Never mind. It still showed up in the forum even though the preview was blank. However, it seems there is a bug in the forum software.
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