URLs are messed up

[excessive34]

Why am I sometimes getting the end of my URL looking like this?

/forum.php?=0c221700db640763d0e6e9d9afebbd31

[Seven Skins]

This happend when you are not logged in to the forums. Once you log this session hash/key goes away.

[cellarius]

Not quite. It probably is "?s=xyz", and it's the session hash you see if you are logged in but do not allow cookies.

[RichieBoy67]

It is most likely addme or Tynt. Do you have either of these installed?