All right!

Thank you for the links, I’ll prepare the Moorhen video soon. You are right 
about the blog for bug report, this makes more sense than bitching by e-mail. 
And I might find out if someone else already noticed something similar.

I’ll just reply about the Edit Chi Angles thing, because it is not doing what 
you said and I checked the feedback : it does let me choose the Chi angle to 
change, then I go back to the model, click and drag. The terminal says it is 
moving the atoms, but the ghost image (the usual faint bonds showing the new 
position as in “Refine”) are not showing up, and when I click Accept (without 
knowing what I am doing, really), nothing changes. Refine and Rotamers and the 
others work fine, this is specific to the Edit Chi Angles feature.

Then, still on Edit Chi Angles, when I check the “Use Hydrogen Atom Torsions” 
box, Coot crashes immediately (this is reproducible):
Termination Reason:  Namespace SIGNAL, Code 11, Segmentation fault: 11
Terminating Process: exc handler [48205]

Another display issue with Mac OS, as you love them?

Great to know some of the bugs are already being cleared, I think the Linux 
virtual machine will wait. Thanks!

My best wishes!

---------------------------------------------------
Carlos KIKUTI, PhD
Structural Motility Team
UMR144 - CNRS - Institut Curie
12 rue Lhomond - 75005 Paris, France
[email protected]<mailto:[email protected]>



De : Paul Emsley <[email protected]>
Date : mercredi 25 février 2026 à 13:55
À : Kikuti Carlos <[email protected]>, "[email protected]" 
<[email protected]>
Objet : Re: [ccp4bb] CCP4i2 in MacOS Tahoe: no wrapper, no creation of graphics 
in Results and problems with starting Coot



On 25/02/2026 12:13, Kikuti Carlos wrote:



Hey guys, Paul,





I don't know if you are aware of the trouble Coot-1 has with rotamer and other 
validation graphs: the residue numbers on the abscissa seem to ignore the 
sequence gaps. The columns are associated with the PDB numbering and not the 
numbers in the abscissa, and I believe the scale of the columns is not right, 
or I just can't spot the problems using it because it's too pessimistic. Plus: 
is green bad, and red good?
This is on m ylist. I will bump it to the top, so that I will look at it in the 
next few days.





How is the Edit Chi Angles button supposed to work? A window opens up but I 
can't modify anything.

You are not alone in being confused by this.

You are supposed to click on the chi-angle button in the Edit Chi Angles 
dialog. This will put the mouse into "rotate chi angle" mode - so now just go 
back to the graphics window and click and drag as you used to.

The 'Save coordinates' function never remembers the last folder I used, so I 
keep a Finder window open there, to drag-and-drop the file name, then modify it 
by hand before saving. At least we have drag-and-drop! Just a bit annoying.
Fixed in 1.1.20 (or is that what you are using?)

 I save frequently because of the sudden crashes (just had another one).

Ctrl-S is "Quick Save As" (for the record).

The chain-to-chain navigation bug has been fixed in HEAD and will be available 
in the next release.

(maybe related:) Oh I can't start coot-1.app from the command line, by the way. 
Permission denied. It works from Spotlight, so it opens from my Home folder I 
guess. I am a bit fed up with these "permissions" that Mac OS asks me to grant 
to programs all the time. Maybe that is causing the issue? I can't find a way 
to grant access to entire disk to Coot, if that could help.
I don't know much about Macs.





Graphics are much nicer now, could we have more options for colors of the bonds?

You have options - unless you want to change the colours of the non-carbon 
atoms.

You can use

import coot

coot.set_use_grey_carbons_for_molecule(0,1)

coot.set_grey_carbon_colour(0, 0.4, 0.5, 0.6) # or whatever shade you like

Do you want more?



Graphics in Moorhen are also great, but Moorhen is still too problematic with 
display bugs - I can make a video showing this, if you are interested.

Yes please.

Generally we talk about moorhen here:

https://github.com/moorhen-coot/Moorhen/issues

but happy to talk here if you don't want to do github.

Coot-1 still works fine with other functions, I still love the sphere refine 
which is not available in the 0.9 series,
Click right-mouse on the right-hand side of the vertical divider in the 
horizontal tool-bar. Several functions can be enabled from there including 
Sphere Refine.

 so I'm considering installing a virtual machine with Linux hoping to be more 
efficient.
I don't follow, but it doesn't matter.

 Downgrading Mac OS is not an option given institutional obligations and my 
other programs.
So I hear.





Of course Coot is still the best by far, so I'm just listing the trouble hoping 
that you find time to fix them. Let me know if I can help with logs and stuff 
(please tell me exactly which stuff).



Well, the version that you're using is a good start. Here's my blog post about 
reporting a bug in Coot or elsewhere:

https://pemsley.github.io/coot/blog/2020/09/21/how-to-make-a-bug-report.html

Paul



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