This morning I uploaded, installed and enabled the Events Calendar on my clients WordPress site. A minute later my site stopped working with the above "Error establing a database connection" error (something I rarely see). I checked all my other WordPress sites and they were ALL showing the same error. I contacted my hosting company and asked them to repair the database, which they did. I went back onto my clients site which now looked fine, but again after pressing the 'Calendar' button on the site it stopped working with the above error.
I AGAIN asked my hosting company to repair the database but this time I logged onto the site I'm working on, went to the admin and DEACTIVATED the Events Calendar plugin. Bingo! Everything now works fine and all my sites are back up and running!
I'm confused as to how a simple plugin could cause such a massive database connection error and effect all my other WordPress sites as well.
Is this a bug in the plugin?