Hello,
I 've just installed Blender (2.25 then 2.27) but at the opening, no picture appears on toolbar buttons, but only black square !
I figure out button actions by reading the small text appearing when sliding mouse cursor below it.
You put me on the right way !!
I had a color display set to 16bits in general display parameter of Windows
I’ve tried to raise it to 24 bits
–> pictures appear in Blender toolbar buttons.
Thanks a lot !
Asta la Vista