Hi everyone, I am using Chrome so I don't think it's because of the browser. I asked support.sas.com/ then, and they were very nice and helpful. They set up a Zoom call and I was able to show it to an instructor. The funny thing was it didn't happen again since then. The instructor and I still don't know why it happened three times before. In addition, during the three times there were black screens, I followed all instructions and it didn't work out. Like [ log out > clear cache > google SAS > go to www.sas.com > log in and launch virtual lab on chrome, incognito, and Edge each time.] In my case, I can log in to the virtual lab the next day because it worked normally the next day. But at that moment when the black screen shows, there's no way I can log in. I highly suggest you guys can use SAS OnDemand for Academics software which the instructor recommended to me. And I found it works better, more efficiently, and with less troubleshooting.
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