Did you try running the PHP snippet I mentioned here? https://mahara.org/interaction/forum/topic.php?id=5290&offset=0&limit=10#post24749
Cheers,
Aaron
]]>My installed PHP Version is 5.3.21.
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Mahara 1.5.1 requires php version 5.3.0 or greater to run.
The php 5.2 series was discontinued in december 2010 and so does not get any security updates anyway.
To run Mahara 1.5.1 you will need to upgrade the php on the server your Mahara installation is on.
Thanks,
Melissa.