I just had the same problem when I updated and had to roll back to the previous version. At first everything worked correctly but I noticed the stats were not working so I did the “Re-evaluate Adverts” and it started throwing errors on ALL adverts.
When activating manually from phpmyadmin it would fix itself but when I tried to save an ad it would throw all the adverts backed to an error status. I just spent an hour checking this out because my site uses 7 ads so this is a big issue for me.
So be sure to backup before you update, but I would advise not updating. Best of luck!