Review 360 - Can't use Comments column

We are having an issue. The Comments box in Review 360 activates like it is going to allow you to do something, but you can't type and the Post button is grayed out. We have confirmed proper Share Settings. We've had both registered and non-registered users have the same result, and we've tested in both Chrome and Edge. If it's multiple people, it's probably not a cache issue. We're using the Modern player, normal sized screens. 

Anyone have ideas? Thanks much!