The behavior of field based value lists has been unchanged since much earlier than FileMaker 9. Simply converting the file to .FMP12 format should not change the behavior of the value list.
It sounds like you have a custom values value list instead of one set up to use values from a field. If the value list used values from the same field you have formatted as a value list, simply entering a new value in the field will cause it to appear in the value list, there's no need for selecting the "allow editing of value list" option that applies to custom value lists.
If I change the field to a Pop-Up list, then I can add new values, but they are not seen by the other fields.
Please note that this is exactly the results I would expect from a custom values value list.
Thank you for your prompt response. Unfortunately, none of the suggestions solved the problem.
The value list was never a custom list and has always allowed for the addition of new items. It worked perfectly in FMP-9. My only thought is that something got "corrupted" when I upgraded to FMP-12. Luckily, I saved the FMP-9 database.
Thank you again for your assistance.
If the value list was not comprised of custom values I fail to see how you could make the list editable.
Especially with Pop up menu formatting.