[Chimera-users] change default application for pdb files

Hi, Since I have installed chimera on my mac laptop, it established itself as a default program to open pdf files. When I try to change the default to another software, it works only for one file at the time. Trying to make the change for all files with the .pdb extension by clicking “change all” button on the file info page strangely reverts back to chimera. This should not be happening according to Apple, as this is the standard way to change the default program to open specific file types. Any idea what is happening? Mirek