If you are about to perform an Upgrade this may just save the day for you.
A little known about feature introduced in London was Debug Upgrade.
You can read the official documentation here:
What does it do?
It enables you to quickly identify what objects were skipped, customized, modified during last upgrade etc of a form. Really, really useful when you are faced with a broken form, or functionality!
How to start?
Basically you enable it under System Diagnostics > Session Debug > then click Debug Upgrade
How to use it?
Perform a transaction i.e. open a form and scroll to the bottom of the form. Here you will see the following options:
Click these to expand and review why your form may not be working:
