[Solved] Help, I can't save dropdown custom fields for my mailing lists!
I have a big problem: I'm on Wordpress 4.4 and I'm using Newletters (Pro) v18.104.22.168. I'm trying to create a dropdown menu for a custom field but I can't save it correctly. After I create some options (whether they're a few or a lot) and hit "Save", I get to an empty Dashboard page (that is, not a blank page, but a seemingly normal dashboard page, aside from the fact that in the light gray zone there's nothing. Not even an error message, nothing at all).
When I try to edit the custom field again, I see that the custom field itself has been saved, but not the options I put in the dropdown menu!
This is really frustrating, can someone please help me?