Flash just won't show

I made some computer games for learning English.

I have played them hundreds of times on my home computer, computers around the world, computers at home in the US (I am in Japan now), and many others.

When I decide to show them to my boss for some extra credit with my job it’s just a blank page. It didn’t prompt me for an error or say I needed a different flash player (they were all done in F8 AS2). Just a blank screen so I look like a moron.

Is there some way to see what’s wrong or make it request a player if it’s not installed? Or has anyone ever seen this before?