No any problem on my site. {http://} button on the VB code and try again. If you still have the same problem the best way is by mannual. simply type bla . bla .net [\url] ( for the last bracket [\url] use '/ instead of '\' ). Do try this way.
I have never used that button until just now. When I did I got this:
First with the coding rendered visable: this site
And for real: this site
When I do it manually I use this:
First with the coding rendered visable: this site
And for real: this site
I thought that I started to use the quotes because I read it on the help page but I don't find it there now. Oh well. But anyway, perhaps the quotes are necessary for some complex url's. If you are still having trouble, post a follow-up with your best try. Maybe we can see what went wrong.