Thank you for writing in, X theme requires the Cornerstone, please reactivate it and make sure it is the latest version (2.1.7).
The reason why you're seeing a lot of shortcodes on your pages is that you deactivated the Cornerstone.
You should able to edit your pages in Cornerstone.
Please watch the Cornerstone Introduction here to see how it works.
If you can not open the Cornerstone, please navigate to Plugins panel, deactivate and delete your current Cornerstone version. Then navigate to X > Overview from there X should automatically re-install the right version of Cornerstone. Then navigate back to Plugins panel to activate it.
About this error:
Fatal error: Cannot redeclare cs_generate_data_attributes() (previously declared in /home/leahp299/public_html/LeahPresser.com/wp-content/plugins/tco-video-lock/functions/includes/cs/helpers.php:4) in /home/leahp299/public_html/LeahPresser.com/wp-content/plugins/cornerstone/includes/utility/helpers.php on line 169
That error is caused by an old version of Video Lock extension. Please deactivate and delete all your X Extensions, and re-install them from X > Overview > Extension (install only the extension that you need).
Please provide us the direct link of that demo slider so we can take a look on it.
X Theme has 2 types of demos, the Standard Demos (which the renew 5 demo is) will only import the Theme Options settings, the home page layout and place-holder images for you to change.
While the Expanded Demos will import everything.
If you have any Caching plugins please clear and deactivate it for now, while you're still developing the site.
Please let us know if you have further questions.
Hope it helps,