PHX not working after saver update

Our hosting company recently updated to PHP version 5.3, after the update our PHX (2.1.3) Evo (1.0.5) stopped work, as we had the option to run past PHP versions we reset our account to run using PHP5.2 which seemed to work just fine.

However on now updating our website content the PHX used within template seems to stops working which of course completely messes up our site templates.

At current we are unable to make any changes to the site as this simply stops PHX from functioning.

Any ideas on where within PHX we should start looking for issues?