When I make a fla file on a pc and fill a rectangle perfectly top to bottom with some lines of text and then open the same fla file on a mac, the line spacing is different? I'm using the same Opentype font on both platforms, same font file. On a Mac the line spacing is somewhat wider so the text goes some pixels past the bottom of the square. Why is that?

Normally, using an opentype font should work fine on both platforms. Which it does when I use it in an indesign document e.g.

I'm using static text, same font file, same fla, but still the text renders slightly different on a mac than it dos on a pc?

Any sollutions?