I have, on occasion, changed a curxptheme to zip, uncompressed, changed colors of png files, rezipped and renamed back to curxptheme without issue, but this last time all seemed fine until the cursor locked and I had a hell of a time getting Win 7 restarted and then managed to change theme even though cursor was not visible after restart. So what sorts of things would cause this? All color changes were in Photoshop CS6. I even saved the theme as a cursorfx theme within the app, thinking this might help, but it also locked. How do I test for issues, or where should I look?