Hello Steven Bland:
Thank you for posting.
FileMaker 10 has not been tested or certified with Mac OS X v10.8 Mountain Lion. This product was developed and released before Mac OS X v10.8 Mountain Lion became available.
While this earlier version may install and run on Mac OS X v10.8 Mountain Lion, you may encounter installation and stability issues for which there is no resolution. We strongly recommend you use current FileMaker software.
With that said, I would also like to add that since you used a migration tool I would suggest removing and reinstalling the FileMaker 10 application.
so if I downloaded v10 as a paid upgrade, can I get a v10 recovery installer from somewhere at FileMaker?
Moving to a later version would cause other porblems. As I understand it if I edit a v10 database with v11 or later it is altered and I can no longer use that database with v10 clients, correct?
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V10 and v11 use the same file format. The file format from v7 to v11 did not change. As long as you do not incorporate any features new to FileMaker 11, your v10 clients should not experience any issues with your file due to the change in versions on your part. If you accidentally incorporate a new feature, your v10 clients can still open and use the database, but the new feature will not function on their machines.
and what about 12, which is what filemaker wants me to upgrade to to fix the issue?
v12 uses a new file format. It must convert the files from .fp7 to .fmp12 format these cannot be converted back to .fp7 format.