Seriously problems after upgrade 1.0.15 to 1.2.1.

Hello guys,

Beforehand thank you for your answers, the forum was always helpful for me.

I have six modx websites, in the 1.0.15 version I had some issues then I decided upgrade to the version most recent 1.2.1 it has been an error fatal for me, google all time send to me notifications about hacked content.

In this moment the sites have Bandwidth Limit Exceeded, all sites..

Somebody has have this problems, how do I fix it?

Thanks.