Newsletter won’t save

Hi,

We have been using Mail Poet for our newsletters for a long time, and for some reason with one of our newsletters (which took a long time to put together) it won’t save. When you click on “save changes” the “saving newsletter” message comes up, but it never goes away, and the changes don’t save. We have tried duplicating it, but the same issue occurs. Other newsletters work, only 1 seems to be affected, is there a fix to this, because some newsletters take a lot of time to recreate.

Thanks.