Updated The Events Calendar to 2.0.10; no problem. But the red alert appeared at the top of the plug-in page saying version of Event Calendar Pro did not match; at the same time, the ECP entry in the plug-in list no longer showed that an upgrade was necessary, even though it was clearly at 2.0.9. So when you click the “upgrade now” link in the alert, WP goes through the upgrade process but returns an error: plug-in is at latest version. Seems the TEC upgrade is setting a flag for the Pro version that it shouldn’t be.
Roger