It seems like you reached the php memory_limit from your server, try increase to 128M or 256M from your php server and see how it goes.

Yeah i'm going to do that but am curious how come its jumped to the limit all of a sudden after the upgrade

Hello Alex,

It really depends on your web host. Since you are on a shared host, the memory_limit in PHP is shared across the rest of their customers as well. When you upgraded, it probably uses up some of the memory but there are possibility that other hosting on the same server is also probably using the memory.

Nevertheless, increasing it to a higher limit wouldn't cause much of an issue