100% doc window vs 100% export window? JPG export.
Hint: I have configured Windows with display scaling at 117% (but I can't image why it would affect the pixel preview).
It probably is the scaling; it doesn't occur on my work machine with no scaling configured.
It IS display scaling. Just tried logging in and out and trying with and without display scaling:
And here it is really obvious: document window at 117% - export preview 100%