I just ran into the same problem. We are running v1.7.12 of Popup Maker and Divi 3.0.106
When I updated Popup Maker to v1.7.14, the Divi Builder would not load and displayed the Divi Builder timeout message to go to plugins and disable them to determine the conflicting plugin. Thankfully the problem appeared on our staging site. I copied the previous version 1.7.12 back to staging.
ALSO.. I was still running into the DiviBuilder timeout issue even AFTER I reinstalled the previous version. After disabling other plugins I came across this thread at SiteGround where the site was hosted in case someone else runs into this.
https://www.siteground.com/kb/divi-builder-timeout-warning/
If you are running your site there (or maybe somewhere else) and are running into this problem, this fix siteground posted which you add to your .htaccess file fixed the problem.
The cause of the problem is that the Divi builder is reaching a certain limit applied to the Apache service. In order to resolve the issue that particular limit needs to be raised. To do that you should add the following lines in the website’s .htaccess file:
<IfModule mod_substitute.c>
SubstituteMaxLineLength 10M
</IfModule>
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This reply was modified 6 years, 11 months ago by
jaxne.
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This reply was modified 6 years, 11 months ago by
jaxne. Reason: Added additional details