Dear PyMOL Experts,
I did check on the mailing list and fond one email about my problem but it seems it was nor resolved:
(http://sourceforge.net/p/pymol/mailman/message/31119931/)

I use PyMol :  PyMOL(TM) Molecular Graphics System, Version 1.7.0.0.
and have the problem that the distance command does not show the 'length' label, only the yellow dashed line.

However, like the email in the list stated, if I use the ray command the rendered image does show the length label.

My graphic environment is (PyMol information):
Detected OpenGL version 2.0 or greater. Shaders available.
Detected GLSL version 4.30.
OpenGL graphics engine:
GL_VENDOR:   ATI Technologies Inc.
GL_RENDERER: ASUS EAH5450 Series
GL_VERSION:  4.3.12618 Compatibility Profile Context 13.251
Detected 4 CPU cores.  Enabled multithreaded rendering.

I also like to mention this behavior is also in PyMOL(TM) Molecular Graphics System, Version 1.6.0.0. (including pymol-code-4051-trunk). This is not the case in PyMOL(TM) Molecular Graphics System, Version 1.5.0.1., where the label is showing. All these Version I compiled on Scientific Linux 6 with the provided compilers. I also use the driver for the graphic card provided by AMD Driver Packaging Version 13.251-131206a-167201C-ATI.

I also tried to switch on/off the shaders (set use_shaders) without any change.

Thanks,
Burkhard
University Frankfurt, Germany.