Can you try lower the graphical quality?
This seems like driver bug or out of memory in your graphics card
Or you can try edit config.xml in the directory:
- %appdata%\supertuxkart\config-0.10 (windows)
- ~/Library/Application Support/supertuxkart/config-0.10 (mac)
- $XDG_CONFIG_HOME/supertuxkart/config-0.10 or ~/.config/supertuxkart/config-0.10 (linux, and other unix based systems)
change force_legacy_device="false" to force_legacy_device="true" and restart stk and see if it helps