Hey @charrame,
Sorry that you’re having some trouble on your site! As of this time there are no known bugs where Events Calendar Pro itself causes post types to fail loading, nor does it cause layout-loading functions like locate_template or similar things to fail.
So, then, the issue seems like it would be coming from code in your theme itself. I’d recommend contacting your theme support immediately and seek for help from there.
In the meantime, one thing you can try doing is seeing if any errors pop up on your site if you head to your site’s wp-config.php file and change this line of code:
define('WP_DEBUG', false);
to this:
define('WP_DEBUG', true);
That will display PHP errors if any exist, which might be quite useful here. If no errors pop up (i.e. no more information about this problem is given), then unfortunately the conclusion that your theme is the problem here will still stand, in which case we unfortunately won’t be able to offer much help since we do not offer support for themes or third-party plugins.
Let us know what you find! If PHP errors pop up after making that WP_DEBUG change, you can copy and paste them into Gists at http://gist.github.com and share links to those Gists here.
Cheers!
George