The page builder disappear after updating to WordPress 4.5.x(maybe you would find the js issue talked in this post), you need to upgrade the Za theme and BM Pagebuilder.
- Go to Themeforest.net download the latest version ZA theme
- Refer the post to update Za theme https://seatheme.net/forums/topic/how-to-update-theme/
- Update BM PageBuilder:
- Please login wp-admin, go to Plugins / Installed plugins , Delete the BM PageBuilder plugin,
- Unzip the downloaded file, find the /za-theme/functions/plugins/bm-pagebuilder.zip,
- login wp-admin again, go to Plugins / add new, install the bm-pagebuilder.zip file.
If you still find the issue after updating, please clean the browser cache.
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WordPress Customization Service from 