You've tried to record a program that uses video hardware acceleration. To get better performance, these applications bypass the usual methods of writing to the screen, and FlashBack cannot capture them.
There are generally 2 types of program that do this:
- Video players
You may be able to find a setting in the Player to turn off acceleration features, or 'overlays'.
If there is a setting to use 'software rendering' or not use video hardware acceleration, this might enable FlashBack to record the game.