I've tested Wargame European Escalation and there is flickering while you play and you select a "unit" to move. I've tested it both with stock Ubuntu 13.10 image and Oibaf's ppa + 3.13-RC8 kernel
This is most likely a mesa bug rather than a kernel issue. I'd suggesting updating or downgrading your mesa packages. For mesa issues, please file a bug here: https://bugs.freedesktop.org/ (Product: Mesa, Component: Drivers/Gallium/R600).