Additionally, the screenshotQuality option appears to be completely ignored. If I stand in one spot and take two successive screenshots with it set to 2 and set to 9, I end up with two 407KB jpg files with no appreciable difference between them.
This is on a completely fresh install, no addons, 4.3.3 (15354). Permissions on /Applications/World of Warcraft are fine. This happens on both the 32 bit and 64 bit applications.