Gnats 4737: Menus are sometimes transparent, intermittently

• Inquiry on Qt Centre Blog (not helpful, as of yet).
   
• Images (see also below):
  • TransparentMenuBug.gif
  • TransparentMenuBug2.gif
  • TransparentMenuBug3.gif
  • TransparentMenuBug4.gif
     
• CADSWES Gnats Entry (4737) (Internal Link)

Note: This problem may be a bug in some "animation" feature which gradually (but quickly) fades in menus as they are shown.