I don't think characters will auto-cast magic if they are set to aggressive, though you can give them a bow/crossbow (for weaker enemies or when you run out of mana).
I believe with some spells (ie instant elemental damage, IIRC) you can order the character to attack and they will continue casting the spell (if set as the primary skill), but most spells will not be repeatedly cast.
Alt-tabbing may shift character/NPC positions slightly, which may cause a problem if they move into or through a wall. The
patch should reduce the chances of that.
Are you shutting down all non-essential programs (especially anti-virus) before starting the game?
If you load a named save does the game minimize as well?
If you eject the CD, insert it again and wait for it to spin up (or quick load soon after starting the game), does the game minimize when quickloading?
The screenshot will be black if you have FSAA (Full-Scene Anti-Aliasing) enabled in the configuration program.
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