Yeah, this has been happening to me, too. The first time was when I was sending a private message, and just a couple of days ago when I tried to make a post. But I think I’ve narrowed down the problem… sometimes the bbcode doesn’t like when you put the [url] code around certain website address. Try omitting (leaving out) the [url] around website address, as it automatically turns it into a clickable link, anyway.
So instead of: http:/ /ww. pixar.com, just write http:/ /www .pixar.com
(I’ve put spaces in it above so it doesn’t turn them into links and you can see how to write it.)
It may also be because of weird characters within the url, in my experience, but I’m not sure. Try the first option above and if that doesn’t work, and you still want to post the link, leave a space between the link and tell people to remove the spaces if they want to visit it, just as quick fix till we get this issue sorted. Hope I’ve solved this problem, maybe someone with more experience could look into this, though.
On A113’s post, isn’t the "url= supposed to be [i][url=[/i] ? This does seem like it’s with the url tags. I’ve never had any of my posts blank, but then again I’ve never used url tags.