Since the site was upgraded I have experienced issues that have prevented me from creating content or responding to content. The issue spanned multiple browsers and operating systems. I was unable to even report the problem because that wouldn't work.
A temporary workaround was suggested by cstanton that has enabled me to access the site while the development team troubleshoots the issue.
Using Chrome, start a New Incognito Window. You will need to accept the cookies and login everytime you start. Nothing is saved in this mode. Incognito has given me access to many things I didn't even know existed. It has also enabled me to create content and make posts. It is not ideal but it does enable me to interact with the site.
I was feeling pretty isolated because I was unable to communicate on the new site. I realize now I had issues that I wasn't even aware of. This temporary fix (use Incognito mode) has eliminated some of the frustration for me during this time of issues. Hopefully it works for you.