Hi Christopher. I think I've worked out the issue with me being able to reply to threads. It's just threads in the Announcements and News sub-forums I cannot reply to and I suspect that might be by design rather than any sort of fault.
I seem to have lost the ability to "like" any posts made by moderators/administrators but the option is still there for posts by normal members.
Like the new look and many thanks for keeping this place running!