The hotkey works, the context menu item looks correct, but the toolbar button doesn't enable. It does, however, enable in the full compose box.
In my experience, Markdown Here doesn't render my markdown text in Google Inbox at all. It works find in gmail, though.
@toddleo: Is this still the case? I use MDH with Google Inbox all the time.
It's working now ;) thanks for reminding me. But the toolbar button still doesn't respond.
Note to others: After installing the Markdown extension in Chrome, you should do a forced full-page reload (or just close and re-open the inbox.google.com tab) before using MDH.
You can probably close this issue - I just tested it, it works fine.
I can confirm that the MDH button gets enabled when in the quick reply box on Google Inbox.