Can't edit modules after update to 3.6.3

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In some cases the backend module edit doesn't work or shows a white screen after upgrading Joomla.

Errors reported

Users see a white screen when editing a module in the backend (see: https://github.com/joomla/joomla-cms/issues/12456).

Versions affected

General Information

This pertains only to Joomla! version(s): 3.6.3

What is the cause

Some javascript used for module editing was modified, however the browser being used is still using the old cached version of the javascript which no longer works.

How to fix

Be sure to clear your browser's cache and your Joomla! cache.