Yeah. The problem as plagued Photoshop users for several years now and it is intentional from Adobe. The reasons are probably related to having to install it on a boot drive and not being able to use a removable drive for installation. I've seen the workarounds but couldn't even begin to walk through one. I didn't set my Mac up to be case sensitive when I got it last August because I rely heavily on Photoshop.
Like I edited my previous post to say, Lightroom doesn't have any problems with it. And Lightroom uses the same engine for it's RAW processing that PHotoshop's Camera RAW does. So that's one option. I'd bet Corel has no issues either.