Hello Silverfox,
It might be a problem with the graphics card driver.
1. Please uninstall your current graphics card driver and download the latest graphics card driver.
2. Please uninstall your Bandicam and download the latest version of Bandicam from
https://www.bandicam.com/downloads/.
If you still have the problem, please let us know your PC specs (Windows version and graphics card model).
Thank you.