Hi Alan-
Can't explain why, because even the WordPerfect options don't cause that
behavior, but perhaps this will help troubleshoot/fix.
Go to Tools>Customize>Commands & click the Keyboard button. Click in the box
labeled 'Press new shortcut key' & type Shift+F3 to see what appears as
"Currently Assigned to" (directly below). Use that same dialog box to
reassign the keystroke to the Format>ChangeCase command if necessary.
If the shortcut shows as currently assigned to the ChangeCase commandas it
should be, but still doesn't work right, post back with details.
HTH |:>)