here's what i did in firefox.
entered the site via New Posts on the error page previously mentioned.
clicked on Forums to bring up the Club Polk home page.
opened a second browser window and copy and pasted address from new Club Polk, just to double check it would work, which it did just fine.
in the second browser window, i deleted the original Club Polk bookmark, and re-saved the new one.
seems to be working fine with no cache or history clearing.