I have created a post that causes an Internal Server Error! A screenshot of the offending text is attached (since I can't post it directly).
When I remove either:
* both < > characters from the first paragraph, or
* Remove the last phrase in parentheses from the second paragraph
Then it will post again. Not sure there's anything that can be done about this, but figured I'd mention it.
ANSWER: False positive on a security script. Probably best to put a space after the first quote.