Hi Roland;
FWIW: I never have any mouse scrolling issues on any of my framework apps (ever) using the mouse wheel. It does not matter what the style is of the DWO. If the DWO dataum is beyond the DW Control's size, then scrolling with the mouse, keyboard or wheel is always OK for me.
My suggestion is to investigate the DC is question and have a look for code on a User Event mapped to a low level O/S message ID or code on the infamous "Other" event that could be causing the crash. Make sure too that you check all the ancestor code on any of these as well. Especially, if they cause other related DC event to fire or make O/S API calls.
HTH
Regards ... Chris
