I just had the same problem, it seems to happen when parts of the cartoon from one of the objects overlaps with similar parts of a cartoon from the second object.

Daniel Rigden wrote:
Dear all

Thanks for the replies.  After a few minutes testing it seems that the
problem is only caused when I create an object which, unintentionally
(carelessly), selects from across different molecules.  If load 1jqd
through PDB loader then do

create parallel, resid 111-116 or resid 82-88 or resid 53-59 or resid
136-142

no problem.

However, if I make duplicate objects then issue the same create command
I see incomplete strands.  The artifacts are worse if there are two
duplicates than if there is one.

So, I don't know why this should PyMOL a problem, but the lesson seems
to be to take more care with object creation.  Incidentally, I could
also get round the problem by saving the object 'parallel' and reloading
it, but this workaround seems unnecessary.

Cheers

Daniel

On Thu, 2008-10-09 at 08:21 -0700, DeLano Scientific wrote:
Daniel,

This is just a guess, but I suspect that there is a problem with identifiers 
and/or residue ordering in the structure which may be confusing PyMOL.  A 
command like

label name ca, segi+"-"+chain+"-"+resi
may help reveal what is going on.

Cheers,
Warren

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-----Original Message-----
From: Daniel Rigden [mailto:drig...@liverpool.ac.uk] Sent: Thursday, October 09, 2008 3:20 AM
To: pymol-users@lists.sourceforge.net
Subject: [PyMOL] incompletely drawn cartoon strands

Dear all

I've just extracted a region of B sheet from a structure to produce a session 
for teaching purposes.  To my surprise, when I created an object from the four 
distinct stretches making up the sheet, PyMOL redrew the previously complete 
strands in a very incomplete way (attached).  When I colour by secondary 
structure I can see that they are all defined as 'beta'.  Why will cartoon not 
draw complete arrows for me?  I looked for settings that might be relevant but 
couldn't see any.  I'm on 0.99rc6, if that makes any difference.

Thanks in advance for your help

Daniel

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