Quote Originally Posted by TinCow View Post
It's a problem with special characters in the thread name, which translate into special characters in the URL. Some browsers have issues with that, and it's a problem I've had to deal with before on the site. There's no easy automated solution because changing settings with either cause problems for some people or disable some features.
Dunno how much work this would be, but you could change the forum links to strip characters past the thread ID (number) in the URLs. That would work, because the forum only needs the number (old vB style forum links still work, too). I.e showthread.php?ID-here or showthread.php?t=ID-here both work.

It goes without saying that people can use the same approach to manually fix links/URLs.