Good to hear that the PNG works for you. If you stick with that format you can avoid the clumsy workaround.

The white box doesn't need to be the same size as the entire graphic. It should just be little but poke out into the margin area of the image where it would be cut off. From memory when I used to have the issue the right and bottom edges got cut off so I stuck the little box down in that corner a few pixels beyond where the rest of the graphic sat.

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Andrew Lockton
Chrysalis Design, Melbourne Australia