washed out

You know the feeling, just putting the finishing touches to a release, and then ... WTF ... all the widgets on the screen have screwed up and showing transparent!  I didn't even touch the GUI!!  After a panic that went on longer than it should have, I remembered playing with my monitor settings the day before and setting the contrast up way high.  On my monitor this had the effect of showing the background colour as white and made the widgets look translucent.  Lesson learnt, phew.  Try it - if you can't see the blue background of this post against the white your contrast may be too high.