This has been a long time issue which constantly pops up randomly. Sometimes when I click the export button everything slows to a complete halt for a while anytime I click on the window or type a character into the naming section. Sometimes takes so long I have to tab out and weight for it to unfreeze. The odd thing is sometimes it works perfectly smooth like the problem doesnt exist.
Nothing seems to really trigger it, It appears on almost every kind of document with or without 3do open.
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In the meantime, do you have a color management profile in Windows? Try removing it or resetting to default to see if that resolves this issue.