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.
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William J. McDonald
Postdoctoral Scholar
Department of Chemistry and Biochemistry
University of California, Santa Cruz