Common issues.
PAGES LOAD SLOWLY
Expected. See the performance article.
Reduce what the builder loads, and cache aggressively.
LAYOUT BROKEN AFTER AN UPDATE
Builder or theme update changed something.
Revert if you can, or fix the affected sections.
Test updates on staging first.
CONTENT SHOWS AS CODE
The builder is deactivated or the plugin failed to load.
Reactivate it.
If you removed it deliberately, that content must be rebuilt.
EDITOR WILL NOT LOAD
Frequently a plugin conflict or a memory limit.
Check the error log and PHP memory.
CHANGES NOT SAVING
Frequently max input vars. Builder pages submit many fields.
Raise it in cPanel.
That is a common and confusing problem: the page appears to save and reverts.
STYLING DIFFERENT ON THE LIVE PAGE
Caching. Clear it, and test in a private window.
WHAT TO DO BEFORE ANY BUILDER UPDATE
Back up, and test on staging.