Hey guys, sorry about that — it should be fixed as of last night.
The fundamental issue is that the “Custom artwork” ad is just an image with an anchor link around it to make it clickable. It’s not technically an ad, so any Ad Blocking software you use doesn’t remove it automatically. However, the in-app ad DOES get blocked and removed, which moves up the entire block the custom artwork image is in so that it now is 250 pixels higher than it ought to be.
The solution I put in place last night was basically to layer the image ad underneath the layer the app is on. That way, even if the top ad is blocked, moving the image ad way up, it gets layered below so you can still use the app.
TL;DR> If you had an ad blocker running you’d get this problem, but now it should be fixed.