I encountered an issue, that my boss couldn't accept.
I write a game with much graphics (about 100 KB) and some sounds (about 6 KB). I don't use any of the standard menus - all is made with custom font, custom backgrounds, etc, drawn on GameCanvas with full screen set.
My problem is that when I use display.setCurrent(), white screen appears for a fraction of a second, and then the requested screen appears.
As far as I know, it doesn't happen on Nokia 7650, but annoys my boss on Nokia 6600. Such white screen flashes also appears on the blue Nokia emulator.