Extremely tall editor sections & a PHP notice after updating today

Hi,
After updating the plugin today, I’m having trouble with the page builder sections appearing extremely tall (something like 1418px each).

There is also a new PHP notice coming up in the debug log when I try to edit a page that was constructed with the page builder:

PHP Notice:  Undefined index: id in /var/www/mywebsite.com/wp-content/plugins/visual-form-builder/includes/class-widget.php on line 82

Could you advise what I should do to fix this? Thanks in advance.
-Tamara