Errors On TIFF Export

[handrawn]

had a 3444pix by 4272pix 600dpi tiff [M and D 14] to hand so gave it a test [blanked the thumbnail as I can't post the image]

this will export at the same size - but not if I double the size in xtreme pro 4, make a 600dpi bitmap copy, and try to export that at 600dpi [it just gets stuck and does nothing]

it does work in xtreme 2

changes to the way things work in xtreme 4 [and maybe 3]are responsible for this as far as I know - perhaps reflected in the way the bitmap gallery reports the original file [see attached]

this has come up before but I cannot find the threads at present..