As with many Linux related issues, finding a solution can be frustrating; it can also take quite some time. In the end though, the solution is often simple. After I installed the beta of Ubuntu 8.04 Hardy Heron, Second Life didn't work as it should; the screen redraws and flickers were a pain on the eyes. It was, as I said before, practically unusable. That has now been solved - by simply turning off visual effects on the desktop! Ouch, should have thought of that before..