10.3 Linux
10.3.1 Window refresh
It may happen that the main window of Webots is not refreshed properly and appears blank at startup or upon resize or maximization. This is caused by a conflict between the Compiz window manager and OpenGL. Simply disabling Compiz should fix such a problem. This can be achieved on ubuntu Linux from the System menu: Preferences > Appearance > Visual Effects > None.
10.3.2 ssh -x
There are known issues about running Webots over a ssh -x (x-tunneling) connection. This problem is not specific to Webots but to most GLX (OpenGL on the X Window system) applications that use complex OpenGL graphics. We think this is caused by incomplete or defective implementation of the GLX support in the graphics drivers on Linux. It may help to run the ssh -x tunnel across two computers with the same graphics hardware, e.g., both nVidia or both ATI. It also usually works to use Mesa OpenGL on both sides of the ssh -x tunnel, however this solution is extremely slow.