On XP, go to C:/Documents and Settings/[username]/My Documents/Adobe/Premiere Elements/[version]/Styles and rename the file "workingset.prsl" as "workingset.old" so that the program will recreate the file when it is next launched.
On Vista and Windows 7, go to C:/Users/[username]/My Documents/Adobe/Premiere Elements/[version]/Styles and rename the file "workingset.prsl" as "workingset.old" so that the program will recreate the file when it is next launched.
If these files are not visible, you will need to first go to Start/Control Panel/Folder Options and, under the View tab, check Show Hidden Files, Folders and Drives.
