I wish this fix was coming directly from Muse...but this fix proportedly fixes not just Muse Themes widgets but other third party widgets...
The fix is coming from the Muse team! In the MuseThemes blog you can read „In the meantime, the team at Adobe has provided us with a small .mulib widget file that you can drop in your site to fix the breakpoint issue.“
Posted to help those who need a fix for this. There was no email, post here or notice from the Muse Team about this fix...it was a notification from Muse Themes..just saying.
No one would know about it unless you subscribe to Muse Themes or see this post. Always makes my day.