If you have bought Recent Redux, get the free update: I’ve released Recent Redux 1.0.1 to the Mac App Store, featuring some minor bug fixes. The bugs covered by this fix would show only under very specific conditions but would make it impossible to open the preferences window, and by this also impossible to edit filters etc.
As a goody, I’ve also lowered the price of Recent Redux to 3.99 US-$ (this is 2.99 €). Will update the free trial version available for download to version 1.0.1 as soon as possible. Have also updated the free trial version.