It is looking sad, isn’t it?

That’s a weird problem, I know the OP on the other thread found a solution, does that work for you?
Also, have you tried to reupload and reinstall? Could be a corrupt upload? Have you tried another browser? I’m just throwing ideas out there, really don’t know what could be wrong since I can’t replicate it on any of the servers where I host MODx sites.
The last option I would suggest would be to install an older version of MODx and see if you can do the configurations fine, then upgrade it to 1.0.2