Meshes do not display in Mac Webplayer

When playing my game on the latest Mac Webplayer, some of my meshes do not display. All meshes are using a directional lightmapped Bumped Specular shader - including the ones which do display.

Any idea on what could cause this?

After further investigation, it appears that meshes with 2 uv sets display, and the ones with 1 uv set do not display. I’ll send a bug report.