What's up with Office 2013's context menu and tooltip shadows?

Update (2015-04-22): Somewhat surprisingly, a recent Office 2013 patch appears to have fixed this issue. Update (2015-03-04): Office 2016 fixes this. Update (2014-10-03): Office 2013 running on the Windows 10 Technical Preview (build 9841) exhibits the same issue 🙁 At some point in the not-too-distant past, Office 2013 started rendering strange shadow artefacts in the […]