Interesting, I hadn't thought of that.
Based on this, I wondered if this a problem with any platformer. I loaded up some flash platformers and was able to replicate this problem. I also wondered perhaps this could be replicated in old Nintendo games? Especially games with quite floaty characters like Super Metroid.
I went and watched some videos of a few SNES games and it's funny how rare they have two platforms of the same height next to each other. They always seem to be 32 pixels up or down. Sneaky <img src="smileys/smiley1.gif" border="0" align="middle" />
I came to the same conclusion you did by setting the gravity higher, but I found it also changes the jump arc quite a bit. I'll play with the settings a bit more and see how it goes but I think I'll also update my level design a bit to try and avoid small gaps like this.
Thanks for the responses. Discovering little design issues like this, even in old games, I always find fascinating.