The disappearing post issue is related to character sets. UBB doesn't seem to be enforcing a specific character encoding, so it's using whatever the author happens to have on their device.
There are multiple "character sets" and different devices have different standards. I'm currently typing on a mac and with this site, the default representation of quotations are vertical single quotes and double quotes -- ' and ".
Those work fine.
If I author on my iPad, the default representation of these characters are "curly quotes" meaning that the left quote and right quote are different, with angles.
Those "curly quotes" cause posts to appear blank. I tried eliminating all the quotes from a problematic post but it was still posting blank from an iPad, so I'm guessing the comma character encoding or some other punctuation may be an issue.
Microsoft Word also uses curly quotes which is why people are reporting that cut and paste from Word causes it to disappear.
I would be that if you author in Notepad and cut and paste you'll have no problem.
Probably worth some research on character set support (or enforcement) with the bulletin board engine you're using.
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