display still flickers with transparent images

[fmw42]

IM 6.5.9.0 Q16 Mac OSX Tiger.

The changelog says:

2010-01-01 6.5.9-0 Cristy <quetzlzacatenango@image...>
Transparent images no longer flicker on certain system when using the display program.

But the following still cause flickering of transparent images.

convert logo: -resize 50% -transparent white logo2t.png

Then either of these still flicker:

1) display logo2t.png
2) convert logo2t.png show:

On what systems was it fixed?

Thanks

Fred