Just downloaded SilverStripe-v2.2.3.tar.gz and installed without problems.
I installed without using the blackcandy theme, and have now added my own theme - everything ok.
I then wanted to add some subpages from the CMS, but it turns out i can't add pages at all, when i click create i can choose page type, but clicking go gives nothing, not even a JS error.
Duplicate does work.
BTW: I just love the new look of Silverstripe website(s) - really nice work