I posted this in the general gimp help before I saw the mac-specific one.
I installed the new Gimp.app the other day and ran the script to alter the X11 dpi to mimic OSX. I use a statistics programme, R.app, which is now having problems using the Quartz graphics device... it's producing horrible images and huge file sizes. I can only assume the two are related as I haven't done anything else.
Is there a script to reverse whatever the dpi script did? And anything else that Gimp may have changed?