No problem, and that helps me to narrow things down a bit. Does the bbcode look something like so?
[url:21039808059093294]www.somesite.com[/url:21039808059093294]
or like this
[url]www.somesite.com[/url]
If it looks like the first example, the problem is likely in the
function bbencode_second_pass
of bbcode.php. If like the second example it's likely in
function bbencode_first_pass
. That's where I would start to look. Give it a try and if you can't figure out, ZIP the theme up for me and provide via PM. Enclose a copy of your bbcode.php as well, if you go that route.
BTW, you might try the pre-edited bbcode.php and see if that works; if you haven't already. If you have other bbcode customizations, it may be easier to modify the pre-edited file, than the other way around.
Just to clarify, the URL and YOUTUBE features are the only ones not working?