We just upgraded to 16.3.6467 last night. Today we noticed that in chrome (version 60+) if we use the reply function from list view to an e-mail that has an attachement; the new email popup the whole body is greyed out (if in night mode, and blank if in regular day mode). We have found a couple work arounds:

1. If you expand the new e-mail window the greyed out will clear up

2. If you double-click on the e-mail before hitting reply and hit reply from the popup window it will work

3. If you attach an attachment to the greyed out e-mail; it will clear up