X11 Window Server AWT Error

Over the last few days we have been experiencing a new error appear in code that should not be causing an error. The code is triggering an ‘exception error in “main” of java.awt.AWTError: Can’t connect to X11 window server using ’ :0’ as the value of the DISPLAY variable.’

For example, I marked one lab submission Monday afternoon with no issues - it ran fine. I look at the SAME lab submission today and get the error. It started about 1 pm (Ontario, Canada time) yesterday (4 April) and now both myself and my students are seeing the error when trying to run projects.

Can anyone help? Thank you!

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Output seems broken ? No more Pygames?

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