From: John Stone (
Date: Wed Dec 14 2016 - 16:44:00 CST

  How large is the trajectory file you're loading? The 32-bit MacOS versions
of VMD can only access about 2GB of memory, so that's a hard limit for
those builds. There isn't a 64-bit build of VMD for MacOS X yet as we
still have to overcome some compatibility issues with FLTK and Tk w/
the Cocoa APIs required for 64-bit MacOS X builds (32-bit VMD builds use
the Carbon API which is stable, but not usable for 64-bit compilations).
  John Stone
On Wed, Dec 14, 2016 at 04:27:35PM -0500, K. Aurelia Ball wrote:
> Hi,
> I have been encountering a problem when running VMD on OS X El Captian
> (Version 10.11.6) on a Late 2015 iMac with 3.2 GHz Intel Core i5 processor
> and 16 GB of Memory.
> Sometimes VMD crashes with a memory error when I load a trajectory,
> sometimes it just freezes with no error when I am just looking at a
> molecule. I was using VMD 1.9.2, so I installed VMD 1.9.3 hoping this
> would fix the problem, but it has continued. From reading other problems
> that people have had on the mailing list, I suspect that the issue is that
> I installed 32-bit Intel x86 version of VMD when my iMac is 64-bit.
> However, I cannot find a 64-bit version of VMD to install.
> My question: Is the 64-bit issue likely the problem? If so, is there a way
> to install a version compatible with 64-bit Mac that will alleviate these
> problems?
> Thank you,
> K. Aurelia Ball
> Skidmore College
> [1]
> [2]
> References
> Visible links
> 1.
> 2.

NIH Center for Macromolecular Modeling and Bioinformatics
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