Despite what the form says, I'm using 3.4.1, TEC 2.0.7, and the latest Twenty Eleven. I can replicate this with no plugins activated other than TEC. It persists regardless of which view is set as the default "Events" view (list or grid) and regardless of which Template is selected.
The symptom is that there is no
post_class() output in the template, but when I turn on WP_Debug, I get a crazy number of Notices and Warnings. Whatever's going on also throws additional warnings for Yoast's WordPress SEO plugin. If I had to guess, this looks like the page wants an ID but doesn't have one. Either way, I really need those post classes!