I do not know if this has been reported before. I could not find it in the project bugs on Sourceforge or in the mailing list archive.
If I rename a protein object, originally created by reading in a pdb file, and then create a new selection of the renamed object, the 'show' and 'hide' commands no longer work on the original protein object. 'Show' and 'hide' are ok immediately after the rename operation, but they break after a new selection is created. I'm using PyMOL 0.97 on Linux. PyMOL was installed from the tarball that includes a precompiled Python 2.2. Mikko