what does the "waiting on canvas" error mean?

[mantini_4]

Student attempting to access an open exam, but screen just keeps saying "waiting for Canvas". This has happened to student multiple times over the last week. 

[SamOHanlon]

Several of my students also got this error when trying to access an exam. Restarting Chrome worked for all but one of them. A point of caution though -- If you're using Proctorio, you must have it set to allow reentry in the case of a lost connection.