Hmm. I've installed it on v1.1.2 and it seems to be working fine.
Have you tried looking at the database to make sure all the tables have been setup correctly etc?
A few things to note. The messaging system seems to default to my browsers default font rather than the font I like to use on my message boards.
Also smilies dont seem to work (DISASTER!) even though I have set them to allowed in the control panel.
Other than that good work!