Sorry, i wish i could gladly tell you something else, however unfortunately i've not deceived. So i described, i can scroll over the total map, raise a selection border and nothing happens.
I saw at the screenshots beneath selected units a circle should appear but however it didnt. I activated the "debug mode" at the ini-file and the mouse coordinate are indicated correctly. If i also turn to window mode nothing changes at all.
Perhaps i should mention i've got a old SIS630 (thanks to etch and xorg finally i got a halfway useful 3D support) in my laptop.
Perhaps anybody else have an idea as well how i could solve the problem.