i am using ps elements 10 on a widows 8 machine for over a year. everything has worked great. i upgraded to 8.1 recently an now when i try to edit a photo the editor won't start. displays message that the file is locked and go to window explorer and unlock it. as far as i can tell the file is not locked. tried unlocker and process explorer. both programs say that the file is not locked. also my version of ps elements 9 running on windows 7 has the same problem. i did get photo editor to work on it own by changing the setting of the file until it would start. but it still will not start in ps organizer.