Unread Posts

[#1]

Normally when I click on 'Show unread posts since last visit' I get 2 or 3 pages to read through.
This afternoon when I click on this link I am offered 1745 pages dating back to before I joined PN. 
Has something changed?

[#2]

The link below should help explain this
Migration of old forums

[#3]

Quote from: Chris

The link below should help explain this Migration of old forums

Thanks Chris - marked all as read and that's got rid of them.

[#4]

Yep, was quite a big influx all at once.