I am having a similar issue since the middle of May. The number of openings have dropped 20% since then.
Constant Contact will not answer me when I ask them if they made any changes since then.
Thank you for reaching out to the Constant Contact Community. It's my pleasure to assist you today.
I'm very sorry you have encountered this issue. We haven't changed anything within our system that would have caused this problem. However, we are happy to research the issue if you would like us to take a look. In fact we suggest taking a look at this post in our Community with further information on this topic. Thank you for choosing Constant Contact. Have a great day!