One example. The Reader (Kurzweil) worked for the first 9 questions and starting at question 10 it no longer read the questions of the test or the answers. The problems may be related to multiple choice questions. Attempted to log in/out Kurzweil, same symptom persisted. Attempted to change settings options in Kurzweil, same symptom persisted. Attempted to move student to a new station, same symptom persisted. Restarted their workstation and the same symptom persisted.
It appears the key factor is the 'New Quizzes' feature within Canvas, as it seems there are several question types exhibiting the issue and it's not present in classic quizzes. Natural Reader and Read Aloud do not work at all.
The free/limited TextHelp Read & Write Chrome extension appears to work inconsistently. Yesterday it worked OK (not perfectly), but this morning it is behaving similarly to Kurzweil when reading Multiple Answer questions - it bounces back up to the top of the page after reading the question.