Hello,
yes, there has been problems with PHP4 with the release. (You will find this issue in other threads already) -- see
www.artio.net/en/support-forums/joomla-e...ions/blank-page/view
There are already fixed files available for download. Please, redownload and reinstall (or upgrade again). (more details in the other thread, see link above)
We apologize for this.
Best regards,
michal