When inserting a control into Powerpoint 2013 then the first time the presentation is played it shows fine, but the second time it is not.

This is related to https://bugreports.qt-project.org/browse/QTBUG-19544 but only in the sense that it seems to have somehow improved since Office 2010.

Steps to reproduce:

• Find out whether Powerpoint is 32/64 (fex by running: depends "C:\Program Files\Microsoft Office 15\root\office15\POWERPNT.EXE")
• Build Qt accordingly
• In Powerpoint: Choose File/Options
• Select "Customize Ribbon"
• In right column "Main Tabs" check "Developer Mode"
• Developer mode tab appears, control group shows active X controls
• Insert control
• Play presentation using slide show