Chrome Version: 56.0.2924.87 (Official Build) (64-bit)
OS: Linux and Chrome (tested, probably others too)

What steps will reproduce the problem?
(1) Start Chrome Remote Desktop
(2) Click the hot-dog menu in the top-left corner.
(3) Click Feedback
(4) Send feedback and click Send

What is the expected result?
Feedback should be sent.

What happens instead?
The Send button greys out but the dialog never dismisses.

I can't repro this with the built-in feedback on Chrome OS (Shift+Alt+I) and I don't know of any other Chrome apps that integrate with feedback, so it's possible that this is a bug in CRD. However, since the dialog opens, I think it's a feedback bug.