From: John Stone (
Date: Wed Mar 17 2021 - 00:30:40 CDT

  From your description, it sounds like you've got two major
issues, one may have to do with the behavior or so-called "retina"
display support with FLTK in VMD, and the other sounds like it's an
issue with how FLTK interacts with the MacOS Big Sur "night" theme.
Can you verify that the problems with the background colors and text
go away if you set your Mac to the classic MacOS color theme?
If that cures the problem, then we at least know for sure that it's
a MacOS theme-specific issue. As for the retina display, I don't
have an immediate suggestion that would necessarily make a
difference here, so let's try the experiment with the theme change
first and I'll see if there are recent FLTK bug fixes or updates
that may pertain to the retina display support.

  John Stone

On Mon, Mar 15, 2021 at 08:06:51AM +0100, Sergio Perez wrote:
> Hello,
> I am having some problems using this version of VMD:
> VMD for MACOSXX86_64, version 1.9.4a51 (December 21, 2020)
> with my mac with this characteristics;
> Hardware Overview:
> Model Name: MacBook Pro
> Model Identifier: MacBookPro15,2
> Processor Name: Quad-Core Intel Core i5
> Processor Speed: 2,4 GHz
> Number of Processors: 1
> Total Number of Cores: 4
> L2 Cache (per Core): 256 KB
> L3 Cache: 6 MB
> Hyper-Threading Technology: Enabled
> Memory: 16 GB
> System Firmware Version: 1554. (iBridge: 18.16.14347.0.0,0)
> Serial Number (system): C02ZV0DFLVDP
> Hardware UUID: 5529FD13-A16C-51BA-AF40-E55C251C67C3
> Provisioning UDID: 5529FD13-A16C-51BA-AF40-E55C251C67C3
> Activation Lock Status: Enabled
> It is extremely hard to select atoms with the mouse, to label them, measure
> distances etc. You click where the atom is and there is no effect, if you
> click around you might be lucky and click on some atom but it's nearly
> impossible to select the one you want. Also some of the panels have a
> black/dark background and are very hard to see since the font is also
> black.
> Thank you very much for your help and I hope we can work this out. Let me
> know if I can help you in some way.
> Best,
> Sergio

NIH Center for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801           Phone: 217-244-3349