That's never worked for me, Scott.
I'll type in an address:
www.finescale.com
I'll paste in an address:
/forums/763326/ShowPost.aspx#763326
Now I'll try to paste, highlight, and use the link button:
/forums/763326/ShowPost.aspx#763326
And what do you know! It now works like it did before! I wonder if this is some weird thing with Firefox? I'm now on version 2.0.0.3.
BTW I've always found that typing in the code ([ url= web address]Unique Title[ /url] is faster than that link button. I've never bothered with the insert image button, either.