Downloaded and installed Gimp 2.8.10p2 from lisanet on Mac OS X 10.9.1 (Mavericks). Edited a JPG from a camera, opened Export As, creating an Export Image window.

If I leave the Export Image window (to look at the original image, or to refer to Help) and then return to it, the Export Image window is grayed out and unresponsive. I can't close it, cancel, export, or change any of the parameters.

I can quit Gimp (without Force Quit) or continue to edit that or other images, but when I try to Export As I get back to the same unresponsive window.