The problem started because of the WordPress 4.0 , probably you didn’t update it in the other server.
The correction is simple if you don’t wish to upgrade.
Inside the file page-builder.js located at Dante/Swift-framework/page-builder/assets/js
Find this line of code
if ( switchEditors != undefined ) switchEditors.switchto( $( '#content-tmce' ).get( 0 ) );
and replace by this one
if ( switchEditors != undefined ) $( '#content-tmce' ).get( 0 ).click();
Also this problem only happens when you are in Classic Editor in the Text tab if you go to the visual tab first and then switch to the Swift Page Builder it will be fine.
-Rui