I'm currently unable to determine what this issue was detailing as the screenshots are unavailable for download from the mantis bug tracker. The most detailed description of the remaining issue is the following, but not sure what it is referring to.

However the "Slicer competes with itself" in this specific issue report still exists. For example, the Save window can become hidden behind the main Slicer window; the only way to raise it again is to click on one of the slice viewer popups.

@lassoan Do you know the details of this issue from memory? You last commented on this issue in Sept 2017

Thanks for testing. We'll revisit this after Qt5 migration.

I could only guess about a pop up such as a warningDisplay or something that isn't appropriate parented to the modal dialog (maybe QMainWindow) in which case it hides the modal dialog behind the Slicer window or something.