Hi MattGood, I encountered the same error after 26Mar2014. My last working 400.vps was dated 26Mar2014.

Within the context of http://forum.avast.com/index.php?topic=57775.0 , I revised the Shmmax value to 133120000 and avast started

to work again.

Perhaps one of the moderators can shed light on this matter.

Best regards.