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overlay issue on DM3730: black border on graphical items

Other Parts Discussed in Thread: DM3730

Hi all,

on my DM3730 board running linux based on kernel 2.6.32 from openembedded I'm using /dev/fb0 for the graphic and /dev/fb2 for the video
(using gstreamer and TIDmaiVideoSink). In order to mix video and graphics I use the overlay on the black color.

The issue is that on the mixed image I got a black border around all the graphical items, except for the vertical, orizontal and45 degrees lines.
I already tried to change the chroma key color, but the effect is changing of the artifact color.

My display is a 10", 1024 x 600, 16 bit RGB565.

Does someone have a suggestion?
Many thanks,
Andrea