IN MUX, after making some changes in cost plan and clicking Refresh, the button disappears for subsequent changes, and those changes do not get saved at ALL!
This can happen on any page where the Group By Option is available.
Once you update values and click the Refresh Button, the button disappears and no additional rows/cells can be updated.
In some places, the header information may also disappear.
Release : 16.0.1
Workaround: Navigate away from the page and come back or refresh the page.
Resolved in 16.0.2