That's not the same issue Brian, but you are correct that it seems the host upgraded, or somehow modified, the PHP installation. Hasoere, yes there are Nuke files that are modified/added. These are outlined in the package. Off the top of my head, it is in /*nuke*/includes/custom_files/custom_head.php. Since in that file, there's a "require" that points to a calendar file, if the calendar file is no longer there, the whole PHP page will stop loading.
If you have an older version of PHP-Nuke, it is possible that the file would be /*nuke*/includes/my_header.php. If you have that file, do not delete it. Simply edit it to remove the lines that were added for the calendar. There is some code in that file that is required for Nuke to work properly. If you delete the file, your Nuke installation will not work.
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