After upgrading to 3.3.1, the calendar pages are no longer recognizing the template overrides in the theme. The overrides were at mytheme/events before the upgrade, but I saw that the documentation now has mytheme/tribe-events so I renamed the directory. Renaming didn’t fix the problem, though.
Here’s the file names I have in mytheme/tribe-events:
ecp-page-template.php
ecp-single-template.php
gridview.php
single.php
In the Display settings, I have “Default Events Template” set as the Events template, which is the same way it was before.