Your comments

I actually figured out the issue.  It turns out that the chat widget uses a cookie called XSRF-TOKEN which happened to be the same name of a cookie we use in our own application.  I changed our app to use a different cookie name and now everything works.

However, I would recommend that you contact your colleagues at getinchat and ask them to change their cookie name to something less generic like "CHAT-XSRF-TOKEN" so that there is less chance of a collision.

Thank you, Sergey. We really enjoy using your products.