I provide IT support for a group of illustrators and we are currently using IsoDraw 7 M040. I recently upgraded one of the users to M090 and ran into a problem printing.
One of the illustrations has text in a layer and the layer color is set to red. I believe the text itself is actually black but it displays as red on the screen. When the users still running M040 print this illustration the text prints in red. When the user running M090 prints out the same illustration the text prints in black. This same illustration has arrows in a different layer set to blue. The arrows print correctly in blue for all users.