"
Bum "
Works fine for me.
(Followed your example; also, image doesn't open for me, letting you know)
Edit: Letting you know, if you write it manually [U RL=' (link) '] [/URL] <------ Like that, you need to write it exactly like that, with the link inside the apostrophes without space, and the text you want in-between the two boxes.
Edit 2: Ah I see what happened. I forgot to include the = in my original comment. Sorry about that. The code is this one: [U RL=''][/URL] (without the space between the U and R)