Hi Richie2016,
- When you say brushes, are you referring to bsps?
- What steps can I take to reproduce this on my end?
- Can you post your crash logs and callstack here? The crash logs can be found at \Unreal Projects\PROJECTNAME\saved\logs\
- Can you post your dxdiag here?
- If it is bsps, how many do you have in the level before the crash occurs?