Problems loading Campaign themes
I have problems loading Settings > Campaign Theme.
I can load the other tabs without problems, but the page doesn't seem to load properly when I click on Settings > Campaign Theme. The yellow load bar doesn't disappear, and modifications to a template doesn't seem to be saved properly.
When I clone an existing theme the window even freezes and I cannot go anywhere (see image below).
How can this be fixed so i can edit themes correctly?
ATM when I use a recently saved theme it displays it in my newsletter without a working css