I am able to log in to my canvas account, but when I access the dashboard, it shows me the white boxes for the classes but it does not load. I tried restarting and login again, but it still did the same thing. When I go to the course tab and select a course, I get a blank screen. There is no was for me to upload anything on to the site or look at individual pages. What should I do to fix the problem so I can access my courses?