Ok on Windows XP but not Windows 7

Hi,

I made an AIR desktop application using Flashbuilder 4.5. I used a Mac with OS Lion for this and the application works fine. My client tested the application on Windows XP and it was fine but when tested on Windows 7 some part of the application did not show up. The application is using a SQLite database. However, not only the data but buttons etc on two related pages are also missing. Has anybody experienced something similar or knows what the problem could be?  AIR applications should independent of the system.

Thanks!