YaST does not recognise new package

I have pointed my YaST installation source to a http mirror of the SuSE directories (in fact to http://ftp.ntua.gr/pub/linux/suse/i386/supplementary/KDE/update_for _8.1/yast-source) as the first choice for downloads, and then my installation DVD. That did the job of upgrading to 3.1 and later to 3.1.1. I now wanted to upgrade to security release 3.1.1a, and while the mirror seems to have updated everything fine over the weekend, YaST does not recognise the new packages. Has anyone similar problems at the moment? I have noticed that http://ftp.ntua.gr/pub/linux/suse/i386/supplementary/KDE/update_for_8.1/yast... packages.DU and packages.en are still dated from 27 March (the 3.1.1 release). This could be the reason? Kostas