That was exactly the issue. We found a manufacturer's program that installed the proper drivers and it worked with no issues after that. Considering that the quality of their computer screen was somewhat grainy prior, this makes perfect sense in retrospect (though I never suspected that an integrated graphics card could be missing the drivers it needed; rather, I would have assumed that this would be a GPU-specific problem). Thank you for the help! Luke ________________________________ From: Tom Goddard <goddard@sonic.net> Sent: Tuesday, May 17, 2022 5:27 PM To: Luke Kurfman-Student <luke.kurfman@furman.edu> Cc: Chimera-users@cgl.ucsf.edu <Chimera-users@cgl.ucsf.edu> Subject: Re: [Chimera-users] USCF CTRL + Left Click Almost surely a graphics driver problem. Chimera needs a functioning graphics driver to know what atom was clicked on. Try updating the system graphics driver. Could also use Chimera menu Help / Report a bug. Tom On May 17, 2022, at 2:23 PM, Luke Kurfman-Student via Chimera-users <chimera-users@cgl.ucsf.edu> wrote: Hello Sr./Ms., Most everyone in my laboratory has access to UCSF Chimera and can use it with no issues. However, one new person has had trouble selecting atoms. Specifically, neither CTRL + Left Click nor CTRL + SHIFT + Left Click appear to work on selecting atoms in a molecular geometry, even though their computer can run the program. They can translate, rotate, and zoom in-and-out of the geometry, and they can use actions such as "Select All" . However, they cannot deselect individual atoms once the entire geometry is selected, and they can only CTRL + Left Click outside the geometry to deselect the entire geometry. Additionally, drag-clicking does not appear to work. CTRL + Click is a fundamental feature that our group uses, especially since we use Chimera for journal figures. Are there any suggestions on how to troubleshoot the issue with selecting atoms? For reference, their computer runs Windows 10 and operates on a x64 bit system. Any help is appreciated, Luke _______________________________________________ Chimera-users mailing list: Chimera-users@cgl.ucsf.edu Manage subscription: https://www.rbvi.ucsf.edu/mailman/listinfo/chimera-users