While generating documents you may be presented with a blank screen after the process has completed. The issue may appear in two scenarios:
Email As: Body Only setting
To resolve this scenario you can do one of the following:
Update the “email as” setting for the one template document to either of the other options.
Add additional desired template documents with “email as” setting not set to “email body”
Chrome version 68
Due to a change in Chrome version 68, you may need to enable redirects similar to how you would enable popups. Use the steps below to enable redirects:
Look for the Redirect Warning icon in the address bar of your browser:
Click the icon, select the radio next to the “Always allow pop-ups and redirects from <Salesforce URL>.
Click the Done button