Hi Mario, You should use Chimera menu entry Help / Report a Bug... in order for us to provide the best information about your problem. That will send more details about your system configuration -- critically your graphics driver version. But from what you said the problem is a familiar one, your graphics driver has buggy OpenGL "vertex buffer object" support. You may be using Mesa (an all software implementation of OpenGL) and some versions of Mesa have this problem. Your options are to update your graphics driver or disable use of OpenGL vertex buffer objects in Chimera using the Chimera debug graphics driver tool. http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/debug/debug.html If you are using Mesa (as indicated in the Report a Bug dialog) you will get 10 to 100 times faster rendering if you install a graphics driver that actually uses the hardware acceleration provided by the graphics chip. Tom

Hi, I am running Chimera chimera-1.4.1-linux_x86_64 on my "netbook" style Acer Aspire 1410 with the following specifications: OS: Linux 2.6.31.12-0.2-desktop x86_64 Processor: Intel(R) Celeron(R) CPU 743 @ 1.30GHz Intel Mobile GM45 Express Chipset 1366x768 pixels

The program runs well but surfaces disappear upon rotation. This is true for solid surfaces, as soon as I set the opacity to 0.99, the surfaces are no longer affected.

Any hints?

Thanks

Mario Borgnia