Palettes are not opening automatically with AVA
Check in System Settings under General that 'Close windows when quitting an app' is not checked, see below.
Check that the files are saved in a location that the Application has access to. You may need to check this in System Settings under Security and Privacy.
Palette is not working as expected
The best way to check a palette action is open it and run through the actions one by one checking each does what you intent individually / one by one. If your palette is going to be used by other people it is worth testing it with a few different files to check that different layer types or names do not break the action.
Why does my Palette action look like a folder?
If you store your palette action on a none Apple®computer it may loose the resource fork so the Mac® does not know what file icon to display, it should still open normally in AVA. If you are to store files on none Apple®server it might be a better idea to ZIP the files for storing them, this would also apply if you are e-mailing palettes to some one.