Did you ever find a resolution to the problem of the "boxy" bitmaps? I have a similar problem and have not yet found a solution.
This happens when you copy from a high density window to a single density window. When copying from a high-density bitmap to a low-density one, the OS will sample just one pixel from each group of 2x2 pixels. When copied back, each pixel in the single density bitmap will be expanded to a 2x2 block.
-- Ben Combee, DTS technical lead, PalmSource, Inc. Read "Combee on Palm OS" at http://palmos.combee.net/
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