Hm. I just tried it as well on a reply to this thread, even with some added text/words, but got the same issue (Refer to the image below) - Preview Post works, but when trying to actually post it it comes up with the error
(Something else I noticed - when I initially tried posting without adding any text, but it had the quote tags wrapped around all the text, even though the error itself is normal if all the text is wrapped in Quote-BBCode, instead of showing the error above the text box it showed it in a pop-up window)
EDIT: I tried another post to this thread that just had "test text" with Bold/Italics wrapped, but that one was able to work (I deleted the post afterwards)
EDIT2: I just tried another post with the same text Ryo had, but I was able to post without the 2nd server name Bolded/Italicized. (Deleted the post afterwards)
EDIT3: Tried another post, but this time added the bold/italics to the 2nd server name and removed one of the COLOR-BBCodes, but wasn't able to post it that time
EDIT4: Tried another, but this time just tried removing the bold-BBCode on the 2nd server name, still had the error. Same result when I kept the bold but removed the italics.