Would PHP 5.3 stop cake cron job working?

I have a site (originally built back in 2009) with a couple of cron
jobs for order notification emails. The site is running CakePHP
version 1.2.4.8284

After the hosting server was upgraded to PHP 5.3, the cron jobs appear
to have stopped working (they still run, but no email is sent). The
website itself is still functioning ok.

Is this likely to be a conflict between the Cake version & PHP 5.3.
Does anyone have any advice as to the best way around this?

Many thanks,

Sarah

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