squeak 4.1 no mouse pointer in ubuntu 10.04

> hello,
> i have installed squeak4.1 from
> http://squeakvm.org/unix/release/Squeak-4.0.3.2202-linux_i386.sh
> (i had to do a sudo sh Squeak-4.0.3.2202-linux_i386.sh)
> under ubuntu 10.04.
> everything seems to work ok except i do not see a mouse pointer
> when the cursor enters the window.
> the mouse works ok, i can use world menu etc, just without
> the pointer.
>
> can anybody give me a hint of what might be wrong?
> thanks very much,
> wolfgang
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