Usually that is because your graphics driver is broken. Chimera uses the graphics to determine what is under the mouse. When that is the problem you also cannot select atoms or residues with control mouse click. The only solution is to get a working graphics driver. A better solution is to use ChimeraX which is similar to Chimera and has many new powerful features like AlphaFold structure prediction and is actively developed.

On Dec 13, 2023, at 11:40 AM, Henen, Morkos via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:

Hello,
I'm running into an issue with using Chimera. When I move with the cursor over a protein residue or particular atom, it is used to show the name/number of this residue or atom. Now, for some reason, this option doesn't work. It has to be something I disabled by mistake, but I can't find that.
Could you kindly guide me on what I can do to fix that?
Thanks a lot
Morkos

Morkos Henen, Ph.D.
Assistant Professor - Research
University of Colorado-Anschutz Medical Campus
Denver, USA
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