Richard,
You shouldn't need to enter a whole phrase to replace a word. Let's turn on some logging. From the Help menu, choose "Edit Debug Settings..." and find the item titled FIND_REPLACE_LOGGING and set its checkbox. Then click the Close button. Then restart Photo Mechanic Plus and reproduce the problem. Then, from the Help menu choose "Reveal Support Data..." and moments later a Windows Explorer window will come forward with the zipped log file selected. Use the 'Attachments and other options' link when you're composing your reply to this message and there you'll be able to upload your zipped PM log file.
Thanks,
-Kirk