[PyMOL] morphing problem

[Criss H. <cri...@gm...>]

I have two objects of the same protein in different conformational states
and I want to show the conformational change using morph.
Each object is a homopentamer, chains A-E.
However, one object has the chains arranged in a clockwise direction and
the second object has them arranged in a counterclockwise direction. When I
morph them, I get a wierd twisty thing as a result of chains swapping with
one another.
I tried to fix this by changing the names of the chains (alter PDB1 and
chain B, chain="E" ...and so on) so that now chain names A-E of both PDBs
are clockwise. Although I succeed in renaming the chains, this has has no
effect on the morphing. SO, I wondered if the segment identifer was the
problem. Each chain also has a corresponding segment identifier (for
example, originally PDB1/B/B which has now been changed to PDB1/B/E). I
tried changing the segment identifier using the same syntax (alter PDB1 and
segment B, segment="E"). Although the output message shows "modified 2667
atoms" the segment identifier in the sequencce window does not change and
selection of segment E yields nothing and the morphing is unchanged.
Sorry for the long narrative, but the main question is: what can I do to
make this morphing work? Thanks.