no Scrollbars in stc Application anymore

Hello,

I know making a sample app would be better, but it is fairly complicated.
On Windows it is fine, and also on older KUbuntu (at least on 2.8.8.3)
But now on kde 4.1 with wxpy 2.8.9.1, suddenly not scrollbars are
visible. Instead of that, only gray areas are shown.

It is similar to stc demo. But here, the scrollbars are visible.
In DrPython (that is the problem app), a styled text control ist used
in a notebook tab (that is a panel).

Any Ideas, what could be wrong?

If that Information does not help, than I have no other choice as to
create a sample app.

regards an thank you in advance,