I’ve fixed a number of things in version 4.3.4 of Default Folder X. If you’re using Default Folder X, you should grab the update – it’s free, and will run more smoothly on your system. A full list of changes is available on the release page, or you can just download the installer here:
http://www.stclairsoft.com/cgi-bin/dl.cgi?DX
Thanks to everyone for their feedback and assistance with testing!