Hi Magali, I suspect you are running Linux and using Mesa (maybe version 6.5.x). The new Chimera version 1.2540 uses OpenGL optimization (vertex buffer objects) that makes surfaces display 2-3x faster than earlier Chimera versions (1.2470). But Mesa which is the OpenGL implementation used on Linux if you have not installed a graphics driver has a bug with vertex buffer objects that causes the sliced bread appearance you observe. To fix this you should install a graphics driver (from Nvidia or ATI depending on your graphics card). This will also give you much faster rendering (10-100x faster). Updating your Mesa to the latest version might fix the problem but I have not tried that and rendering would be done without hardware acceleration which is slow. Currently there is no way in Chimera to turn of the vertex buffer object optimization. The Chimera web page on graphics driver problems gives some hints about how to install a graphics driver if you have not done this before. http://www.cgl.ucsf.edu/chimera/graphics/graphicsbugs.html Tom Magali Cottevieille wrote:

Hi,

I have just installed version 1.2540 of Chimera (I had before version 1.2470). There is a problem with MRC and SPIDER EM volumes: see attached image: left a volume in the new Chimera; right the same volume with the old Chimera. Is it a bug, or linked to my configuration??

Thanks in advance,