Partly due to the strangeness that drove me to change hosting providers I found out that the previous version of ProgPress had an issue running under php4. That should now be fixed in the latest version (0.8), now available on the ProgPress plugin page
%7Cutmcsr%3D(direct)%7Cutmcmd%3D(none)%3B%2B__utmv%3D33883653.-%3B)