GAME ENDING ISSUE with Xbox 360 DEMO!

1. Description:

When playing the Xbox 360 demo, after a while the HUD interface essentially disappears and is unable to be brought up on screen. Basically, when you hold "RT" or press "Y" nothing shows up so you don't know what you are doing. I can still make buildings and do all the functions that come up with using the interface, I just cannot see what is it I am choosing.

This has happened during two seperate playthroughs of the Campaign section. There doesn't appear do be any rhyme or reason for this to happen, only that it occurs after a decent amount of playthrough. Once it happens, there is no point in continuing to play since you cannot tell what it is you are choosing from the HUD interface.

Hopefully this doesn't happen with the retail disc!

Anyone else experiencing this?