When I get back to the forum and I want to see new post by clicking "Catch up" in the upper right corner it doesn't work. On the next screen it says my sesion has been reset so all thread are then marked as old. Do I need to change some setting on the forum?

New posts are shown by orange envelopes on threads.

The catchup button lets you reset it to show all threads as read.

David

Aaaah that explaines a lot. Is there no single button to read all the new post since last visit?

The main page shows what you are looking for

http://www.locostbuilders.co.uk/