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Every single time I've tried to post a thread or a reply to a post on your website, I get the invalid post content error message. Every single time. Usually I can get things to work by breaking up paragraphs and just making another post with the second paragraph. This bug is highly irritating and the message could be more descriptive. Every time I try to get a question answered on your product, I am met with this road block.
I've attached a photo showing the exact text that resulted in an invalid post content error message. I had to format this text to a markup language to be able to post.
Using Windows 8 with Chrome (but IE also fails).