René Genz,
I have found a workaround. Now that the 'viewport'-related command on 'keystrokes.cfg' doesn't work. We can use 'ctrl+alt+left_mouse_dragging' to move the 'viewport' instead. I am now using it and be able to read all the texts within the 'viewport'. Note that I set the configuration as follows.
<keystroke action="resize" AltMeta="1" Control="1" key="b" />
This seems to be a requirement as after the first logging in, some times, it shows a fullscreen version. We need a way to switch it to 'viewport' mode.
-- heng
Where there's a will, there's (still) a will.