I’ve been researching the Java problem we ran into in class today, and I may have an answer. But it would really help me to know which version of the Mac OS X operating system each of your systems is running. From the Apple () menu in the upper left corner, choose About This Mac. I just need the first two lines. For example, mine says: Mac OS X Yosemite Version 10.10.5. My working hypothesis is that the people who are experiencing the problem are running some version of El Capitan (10.11).
Please leave a reply to this post with your operating system information. Thanks.