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I rarely use this feature, but I happened to click on it for once today: when viewing an individual subforum (like Database Development) and you click thread tools -> mark forum as read, you get an invalid token error page instead.
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and:
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I get the same issue, for me it seems that only the VB6 and VB.Net forums work correctly.
I use it regularly (in conjunction with 'New Posts'), but as it has been failing since the upgrade, I simply ignore many of the threads I would normally read.
There was some work done on this site, and it seems to be fixed for me now... does it work for you?
Seems to work for me now too