Hi Henning, Well, it depends what you were actually trying to do. If you are trying to show an isosurface at level 2.3, you do not want "style solid" ... instead should be "style surface" If you are really trying to show a transparent "solid," however, as the message says, the "level" cannot be just one number, it should be two numbers separated by a comma. <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/volume.html#general> I hope this helps, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Feb 28, 2013, at 2:35 AM, Henning Stahlberg wrote:

Hi, The command volume #5 level 2.30 color 0.6,0.6,0.6 transparency 0.4 style solid doesn't work on my computer (OSX), Chimera (Version 1.7, build 38197) requests that "Solid level must be <data-value,brightness-level>". What am I doing wrong?

Thanks for any suggestions, Henning.