Button section was not overridden in my application. And Issue was also there in the ML8 (V7.1.8).
It was from Work- class, section name was pyDirtyCheckConfirm.
In this section we had save button, if click on the save button, i'm getting an popup error message. If i click on ok of the that popup, machine getting hanged.
I think the issue due to Close After Save check box was there in the Save Action in the save button.
I was tried by remove "Close After Save" check box from save action and adding, close action to the save button. its functioning the save option but case was not closed immediately after click on the save button.
There no overridden section which is relating to this issue in my application, it from Work- class.
If i click on close button, to close the case it asking for the save changes. If i click on save button i'm getting an error message like enter mandatory fields. If i click on the ok button of that popup then machine got hanged.