Hi William, Chimera shows the 4.6 trajectories I have on hand without problem, and there shouldn't be any incompatible changes between the 4.6 and 4.6.5 releases. Therefore I think I'm going to need (some of) your data to figure out the problem. Can you send me your .tpr file and a few frames of your .xtc/.trr file? You can write out a .xtc/.trr of just the first few frames of your trajectory with Gromacs' trjconv tool with the -dropover flag. --Eric Eric Pettersen UCSF Computer Graphics Lab http://www.cgl.ucsf.edu On Mar 25, 2014, at 12:20 PM, William McDonald wrote:

Hello Chimera users,

I recently upgraded my gromacs simulation software from 4.5.5 to 4.6.5; however, when I attempt to load a new simulation trajectory (either a .xtc or .trr file), Chimera allocates ~13GB RAM causing my machine to swap, and Chimera never loads the trajectory. The old trajectories from gromacs 4.5.5 load with out any problems. Has anyone else experienced this?

I am using 64 bit Chimera 1.8.1 on a dual quad-core Mac Pro running OS 10.6.8. The simulation has ~50000 atoms of protein, lipid, and water and is 1ns long.

-- William J. McDonald Postdoctoral Scholar Department of Chemistry and Biochemistry University of California, Santa Cruz _______________________________________________ Chimera-users mailing list Chimera-users@cgl.ucsf.edu http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users