Authentication error marking posts as read.

[#1]

Using this URL https://community.plus.net/t5/forums/unreadpostspage/tab/message:full and navigating the to the last post I clicked options and "Mark all Posts in Community as Read" which resulted in this error.

[#2]

And being Marked as New.

Mentioned in https://community.plus.net/t5/Community-Site-Feedback/Priority-Forum-bugs-have-appeared/td-p/1324025

[#3]

Oops, didn't know it had been raised before. I've not read all the post in that forum!

[#4]

Not to worry. I've asked for that other thread to be pinned for visibility until the issues are resolved. It's a real pain, as it had been working quite well until that, despite the shortcomings and features we still want adding.