Mouse wheel + multiple windows = crash!

Hi folksI'm having terrible problems with the current version (6.2.0012) while using multiple views of a model. With just a single window open all works fine, and scrolling with the mouse wheel zooms in and out. With multiple windows, even accidentally just brushing the wheel crashes BricsCAD.I use a non-standard mouse and driver (Evoluent VerticalMouse) but have had no problems with any other software.Phil BYork, UK