Mouse wheel scrolling problem

I've just installed 9.1.0.1 (was using 9.0.0.9), and seem to have developed a problem with the scroll wheel.

Previously, I could select a file, start to drag it, then (still holding the left mouse button) use the scroll wheel to quickly scroll the lister to show the sub-directory I wanted to drop the file into.

Now, as soon as I start to drag the file, the wheel ceases to function, and the only way to get to the sub-directory, is by moving the file to the top of the lister window, and waiting for it to scroll (which it does very slowly).

Using XP32, Dopus 9.1.0.1, and a Microsoft Intellimouse Optical.

Can anyone else confirm this problem?

Confirmed and reported to GPSoft.

Thanks nudel, much appreciated.