My psychic abilities are telling me that you have upgraded to 9.1.6 or .7.
Certain folders have been moved. Logic looks for these (Tuning Tables, Templates to name two) in the Logic Pro.app package contents (right click on the application). Look in "Resources" for the Tuning Tables folder, and copy your custom jobbies to that folder.
Well it seems you really are a psychic ;-) I moved my tuning tables inside the Logic Pro.app package and they instantly showed up in the tuning dropwdown menu.
To be precise, it seems that tuning table files need to go in /Applications/Logic Pro.app/Contents/Resources/Tuning Tables/.
One has to wonder though why such changes in a minor version update ? And why hide them inside the Logic Pro.app package. Is there a technote detailing all those changes ? I have many folders inside /Library/Application Support/Logic. Are they all obsolete now ?
In any case, thanks a lot for you help.
It's not documented AFAIK. I couldn't tell you what was moved, either. Just that some are. The stuff was moved in the .6 update. Little things like one template used to have a "Studio Brush Kit" & 'Studio Tight Kit" now has just "70's kit." Same template name - different location, and Logic doesn't look in the HD path for things that were moved into the .app folder.
My guess on the reasoning behind the move is that it is the same mindset that makes the user library invisible in Lion.