Okay, here's an update:
The top part of the tournaments are shown, but only for a very short moment (less than a second). Then they disappear.
I mean, they are shown and then they are gone... this can't be an error - this has to be programmed, or?
Maybe it is caused from the same thing that makes seats overlap in the overview:
By the way: why aren't blacklisted players only shown under my games, but not under open games?
(Opera and latest firefox)
It would be helpful to see blacklisted people in the overview of open games so that we don't join games of them.