We also experiencing this problem since March 23, we were not sure where the problem was until the writeup from @programmerbear. Thank you for that. Btw also thanx to @bloog
@wysija please solve the issue or remove the plugin from the repo immediately.
We have tried to upgrade to version 3 with some projects (a few premium), but unfortunately all version 2 data can′t continue to be used old sent newsletter as a template. Which is often to be expected after a major update, fair enough.
Please do not @ ping unrelated people in the support forums. Abuse of this feature will lead to your account being blocked from the forums. -moderator