Hi Mark,
yes, they match, the refresh rate is 60Hz in both projectors.
the frame rate of the videos are 30fps.
so the frame rate is double of the refresh rate, and Isadora preference is set to 60fps.
well, yes, but now I'm trying with two monitors (16:9 and 16:10), but I noticed the same with the two projectors (both 1920x1080). (Now I don't have the both projectors here, therefore the monitors for testing.
yes, the monitors (or projectors) are/were aligned as you show, top edges aligned.
Best,
Lauri