This is depreciated as the course has moved online due to the COVID-19 pandemic. When it is restored to in-person, the following may be applicable to get the DE2 boards working:
Close all programmer windows (keep the main window open)
On the top menu bar open Tools -> JTAG Chain Debugger
Click “Test”
Wait 5 seconds
Click “Test” again (hopefully it doesn’t respond)
Either: Click “Wait” when Quartus crashes OR Wait until 2 error messages appear on the bottom console of the JTAG Chain Debugger window
Restart Quartus and repoen your porject
Adapted from the Dinky theme on Github Pages