Assault chart missing?

[J6A]

I just downloaded 3.1 and the charts module.  When I start a new game from the menu, all is good.  However, when I load a file from a game I was playing on 3.0, the Assault Combat chart is blank.  The other ones are all there.  Any idea why this is happening?  It's not critical, I can just use a physical copy while we play out these scenarios, and it is odd.