I'm seeing the same issue, Chrome only. Strangely, if I click on a TMC or TMS post, which also comes up with the lightbox effect, and click a MUDList post right after, it resets itself, and works fine. Have to look into it in more detail. It's possible the lightbox package has been updated since.
d20MUD Star Wars: Role Play, PvE & PvP using d20 and SAGA rules
d20mud.com port 6000