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Another user reported a similar issue and it turned out to be a conflict with another plugin. This is often a hidden cause of many issues. The only way to know for sure is to systematically test each plugin. Common culprits are security plugins and other page-builder plugins.
Glad you found the solution. Let us know if you have any further questions.
There are WordPress plugins that allow you to add the necessary items to your site. You also have the option of creating a child theme. Editing of the HTML <head> element from within the user interface is not currently available in BoldGrid, but if you think this would be a good addition, you can always submit a feature request.
That is a known issue the BoldGrid team has been made aware of. We'll post an update once it's been resolved.
In WordPress 5.0 it's possible to select different editors. I'd advise checking to make sure you're using the BoldGrid Post and Page Editor. You can select this editor when editing a post or page. Click the editor box in the upper right corner beside Screen Options.
Installing a fresh Uptempo theme will use the starter content. That's why I'd advise installing it in your staging area. Then you can copy over the content. This may seem tedious, but it's always a good idea to review your content and revise it anyway. This helps keep it fresh.
As far as using the Call to Action strategically, remember that it's likely going to be the first thing that catches a visitor's eye when they land on your site. That's why it's there. I'd advise trying to encapsulate the core values of your company/brand in the space available. Also, the call to action is where you let your visitors know what you'd like to them to do (sign up, learn more, buy now, etc.), so you can put that direction in the button.
That article is meant to demonstrate how CSS can be used to address the issue, but different themes may use different CSS selectors so the code will not be exact in all cases (and selectors could change over time as themes are updated), and elements on the page may have a different arrangement. I'd advise using your browser inspector to target the elements on your page as they appear for you. But in the long run, unless you are highly adept at CSS, it's safer to try to accomplish your goal using the editor tools and the options in the Customizer.
In this case, a CSS solution without the guidance of a developer may not be the best course of action, since it will require extra maintenance. (Any advanced coding intervention would.) A newer version of the theme may react differently with CSS added beforehand. I'd advise installing Uptempo again and using the Call To Action widget strategically, or use a different theme that features the background image more prominently. If that option doesn't work for you, you could try targeting the .main CSS class. Again, I don't recommend that, but it may provide you with a short term solution.
It's possible your WordPress updates page has cached old information. It may clear itself. Or, you could consider refreshing it.
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We would definitely more information in order to provide any kind of troubleshooting steps. Was there a particular time that you noticed the button went missing? Is there a possible way to replicate the issue?