After updating an operating system graphics driver while Matlab was open, an error may occur upon plotting in Matlab like:
MATLAB has experienced a low-level graphics error, and may not have drawn correctly. Read about what you can do to prevent this issue at Resolving Low-Level Graphics Issues then restart MATLAB.
The solution to this issue typically is, as the message suggests, just restarting Matlab. A full reboot is not always necessary, but try that if the error persists.