After doing some reading I found a lot of posts on the topic on vbulletin boards saying that changing from the WYSIWYG editor to a basic editor would resolve the problem. Sometimes changing back to the WYSIWYG editor would work again. I don't see this as an option on these boards though and it doesn't really explain why the issue just started happening.
Also, when trying to send a private message I get the following error:
“ |
Please complete both the subject and message fields.
|
” |
So, yeah. It basically isn't detecting that there is any text being typed in the message field. ...and there is. I can assure you of this.