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Brian LaRueBrian LaRue 

Creating Posts, Polls, and Questions - Cannot Post to Chatter

I've just begun the "creating posts, polls, and questions" module on Trailhead. I have progressed to the part where you're supposed to post something via Chatter. However, my issue is that, I'm not able to type anything in the textbox.

I can see the Post, Poll, and Question tabs. Therefore, it doesn't appear to be a layout issue. When I attempt to click in the field my mouse cursor changes to a red "no" symbol and the "post" button is greyed out. This prevents me from typing anything in the field.

I have checked in Setup and Chatter is enabled. I am using the Lightning layout, Summer '17 release, and Google Chrome as my browser.

Any ideas?
Qiuzhen CaiQiuzhen Cai
I have the same problem using chrome. When I switch to other tabs and switch back, I can type in into the post now. But it is annoying.