Yesterday one of our users reported that they are getting JavaScript error and the Marketing List’s form was looking a bit different.
On analysis, we found that the field that was moved to a different tab resulting in JavaScript error and also the Member sub grid (unique to Marketing List) was moved to the bottom of the form in the new tab.
We check the version of the product
So, looks like it was updated that resulted in this issue. And this had affected all our other sandboxes instances. We then manually updated the form in all our instances to fix this. And also it impacted the default OOB form of the Marketing List and the other new custom forms were untouched.
Has anyone else also faced the same recently?
Nishant Rana's Weblog 
I guess we can only expect more such changes as April’s update approaches. That said, it’s good to see the marketing functions of Dynamics being improved
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And we are no langer able to copy a ML from the view, and the Conflicts Tab views are changed to the worse
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So you are also facing the same issue Alexander ?
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Hi Nishant, Our client is also experiencing the same issue. Our members subgrid is replaced by Campaign subgrid (which we don’t even use), together with some other minor changes. I logged a support ticket with MS.
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