Each time I click on a text field, there's a popup saying my version is too old. If I try installing from the popup, nothing happens. I need to send in a large amount of banners asap, but am currently unable to change text because of this.
Thanks for your answer! After looking some more into this, I've found the issue!
Since we switched ad service from Adform to Doubleclick, I had added a clicktag link directly in the html document:
<div id="Stage" class="EDGE-102869258">
This triggered the popup for some reason, but it worked fine when I commented out the a href tag.
So now I just need to read up on the correct way to implement the clicktag.
Sorry for taking up your time!