We’ve heard rumblings of some Gmail changes that have affected Integrated Inbox for some users (Thanks for reporting this Dustin!). We are looking into this right away — and we will be releasing a fix shortly. If you suddenly aren’t seeing your Integrated Inbox (not even the little icon to the top right of your Inbox this could be the problem)
Thanks for your patience as we look for a solution to this recent change. Here’s to hoping it’s only affecting a small number of users right now, and we’ll have this resolved before YOU experience it!
Your Integrated Inbox Team