I'm getting the error "Server plugin is out-of-date" on iPhone users only. Forum is running 1.02 of the Tapatalk plugin and iPhones are running 1.9 of Tapatalk app (iPhones running OS 4.0.1). Users with Androids are reporting no problems.
Classic question If this issue only appear in Participated tab, it is currently not supported. we will hide this tab until the SMF 1.1.11 plugin catch-up.
Well I have already reported it: http://www.tapatalk.com/forum/showthread.php?t=3326 It seem related.