lpd said:

Wondering, is that normal/standard for the player to do that?

No. And 24fps is the less-frequently-encountered framerate, so if a player was just buggy, I'd figure that would be the framerate that would screw it up. It's possible there's some sort of problem at an intermediate layer, such as if you route your HDMI cable through a receiver. But it's a bug.

I'd check for firmware updates if you already haven't. Also I know of at least one player that will only output 60fps if the source is 720p, but can do 24p correctly for any 1080p source, something to do with a bug in the scaling.