If you are having crashes related to using the SubTool scroll bar there may be a conflict caused by using shell applications.
Two applications that have been named are:
- Direct Folders
- No Known Fix other than uninstalling Direct Folders or turning it off before launching ZBrush.
- Display Fusion
- Fix: Right click the Display Fusion tray icon, go to Settings >> Compatibility. Add the ZBrush application and disable Application Hooks for it.
Here is a post on ZBC about some users talking about it solving their issue as well: https://www.zbrushcentral.com/t/crashing-when-scrolling-through-subtools-too-quickly/345896/14