Hi Ryan,
Are you using this syntax for the post's URL?
[url]http://smartbear.com/forums/f83/t90208/system-error-when-posting-url/#90208[/url]
I'm asking because you posted the link with the [b]postid[/b] argument which isn't supported here:
[url]http://smartbear.com/forums/f83/t90208/system-error-when-posting-url/?postid=90208/[/url]