Hi - I've got a similar problem with Display.screenshot on the main screen of a Blackberry Curve running v4.5.0.124. The problem seems to relate to attempts to take a screenshot while the display is updating (of which there is quite a lot as the text alongside each menu item fades in and out as it is selected). Often when moving the highlight from the icons on the left to select the volume controls on the right I get plain white rectangles in the region captured by the calls to Display.screenshot.
Does anyone have any ideas for how to avoid this problem?
Cheers!