After trying to fix this problem unsuccessfully for several days I found another, unrelated thread that suggested that ARB WideGui 1920x1080 for SH3 has problems with desktop resolutions that are higher than 1600x900.
I found that simply changing your desktop (not game!) resolution to less than 1600x900 before starting SH 3, will allow you to ALT-TAB as much as you want from within the game.
Hopefully this can be of help to others who need to be able to switch to desktop while playing.
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