Help with Scenario - POLAND BREAKOUT

[Glint]

A few times I have downloaded this scenario from the Blitz, but everytime I try to play it, I get visual errors. i.e, Info icons with no details, can't highlight units by clicking on them, etc.
I've played larger scenarios than this with no problem, so don't think it's a problem with my PC memory, only had this problem with this scenario.
Anyone else experienced this or give me a clue to what I need to do to play the damn thing!
regrds
Peter