You may be the happy owner of a corrupted database file, welcome to my world :-)
Try the to recover it and see if it's reported as corupted or not.
P.S : On mine that's the scripting menu, I can't organise it. Every change in its organisation, wont stick.
There have also been issues with long layout lists failing to display as expected. Back when Fmv11 introduced layout folders, there was a warning that only 255 items could be in the list before it quit responding/displaying as expected.
Take a look at how your 500+ layouts are currently arranged, and see if you can modify it so that any single-level list stays under the 200 mark.
If your current file started pre-11, have you had some problem with the layouts ever since updating it to the newer version?
Thanks for the reply and suggestions. The file came out ok with no errors in the recover procedure and the file passes the Verify/Clone Backup check during daily, weekly and monthly backups using FileMaker Server where it's hosted. I'm hopeful that it's not corrupt, but maybe I can get more insight at the Developers Conference in a couple months.
Thanks for the reply and suggestions. I have fewer than 200 in any folder and as I play with it and move stuff around, it now only shows 7 top level folders. I'm guessing you may be onto something with a total quantitly layouts so as I move heavy folders up the chain, it ends up just showing 7 instead of 8. Since the file is seemingly ok as far as corruption goes, I'm going to hang tough and talk to the engineer types at the Developer's Conference in July.
And please report back on what you learn. All too often, threads with intriguing issues seem to just fade away without us learning what finally came out of it.