Version 4.6.6 of Default Folder X is now available on the Default Folder X release page. It’s compatible with the developer release of Yosemite, and addresses a number of issues as well. Among them, it corrects problems with unintentionally triggering the discrete graphics card on Macs that have one, applications saving files with the wrong name, and an annoying glitch that could cause OS X to ask for your admin password while you were opening or saving a file. It also enables rebound in column view as well as icon and list view and provides some user interface improvements.
If you’ve purchased a license for Default Folder X 4 already, this update is free. There are more details and a download link on the Default Folder X release page.