I think this a is time out issue but it only seems to happen to me at this forum and is a little annoying sometimes especially when I'm away from my computer for awhile.
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When I search for new posts and take awhile getting thru them I click on the last page of them and get this message and can't see the last page of threads. Happens at other times too... Time out I reckon and I'm probably the only one bothered by it but I thought I'd ask if the time out limit be extended a bit???