Ok, I was just discussing this with GGN and he thought you meant his intro (big D-Bug logo moving in a circle, text over it) and I thought you all meant my intro (static D-Bug logo, wobbly text over it)

However, we both concluded it doesnt matter as they both use standard trap calls to read the keyboard.

I do, however, know that the strobing/disjointed text you are describing does indeed happen on my intro when the falcon is exhibiting the very well known twinsync bug, but this doesnt explain the MSTE problem.

What MIGHT explain that is this: Less cpu cycles/frame in NTSC and the intro running over that time (usually caused by the music taking to long to play)

Try them in 50Hz see if you get the same issue.