Webchat has its quirks, so we recommend using it only if you don't know your way around a proper IRC client, or regular IRC will not run. If you want to try your luck with one, try mIRC (Windows). You can set mIRC up nicely, too.
If all else fails, a different webclient is mibbit.
Note: it can be very quiet in there. If you want attention, find pinkgothic (likely on a name that says Taika{...}, Nechku or Dread) and send a private message. If she's not AFK, that's a sure way to grab her attention.
Also note that #dataclaw is not an Urban Dead channel primarily; most people in it don't play the game. So don't be confused if no one knows what you're talking about at first.