I have run these forums on this server before
I don't think its IIS or Windows thing yet.. that was older versions .. this new version fundamentally different and had lots of forum goodness in them
I will be adding the SSL cert as soon as they are up
Don't have it yet..
I see that your baseurl is blank, try duplicating the value of the full url and see what happens...
Same behavior when changing styles adding full URL to the blank / Relative field