Fonts and CMS' shouldn't be the problem... well, of course, if you have a lowercase-only font, that'd be your reason... ^_^ I seriously have no idea what script could've caused this, because I'd say you need to modify Input.downcase / Input.upcase definitions to get to the problem you have, which are hidden classes and absolutely pointless to change... as it appears to surely be a scripting problem, though, you might post a list of what scripts you have applied to your project and I'll see what I can guess from that...