Tried on two Leovo T500, both with win xp and german client GW8 HP2

As soon as user changes to a proxy account the groupwise screen gets
'corrupted' shows white screens rather columns.
Have to minimize and back to desktop to get a correct groupwise window.

Tried to patch the Lenovo Boxes with all current drivers and patches
without effect.

Dont know what else we can try to fix.
Sounds like a graphics problem, but it doesnt happen with GW7 client or
other applications.