There's several things broken on PPRuNe, sounds like this is another. There was a rumour (it's that kind of site after all) that we were going to upgrade to v4 of vBulletin, but it didn't fly for some reason.
What does the number of posts mean anyway - it's not the quantity, it's the quality that matters!
I "lost" 3 years worth of posts in the great PPRuNe crash of 2003...
Oh, and as mixture may be obliquely pointing out, Jetblast posts don't count.
SD