If you have an ATI 9000, 9100, or 9200 (including 9250) series card, you will not see any units in the game.

This is due (apparently) to ATI's drivers not supporting some functions that CoH uses.

Only workaround at this time is to buy a new video card. See the game's readme.txt for supported models. (Shown below for ease of access).

1.2 SUPPORTED VIDEO CARDS

ATI RAdeon 9500 series
ATI Radeon 9600 series
ATI Radeon 9700 series
ATI Radeon 9800 series
ATI Radeon X300 series
ATI Radeon X550 series
ATI Radeon X600 series
ATI Radeon X700 series
ATI Radeon X800 series
ATI Radeon X1300 series
ATI Radeon X1600 series
ATI Radeon X1800 series
ATI Radeon X1900 series, or better with latest manufacturer drivers.
NVIDIA GeForce3/Ti series
NVIDIA GeForce4/Ti (excluding the GeForce4MX series)
NVIDIA GeForce FX 5800 series
NVIDIA GeForce FX 5900 series
NVIDIA GeForce 6200 series
NVIDIA GeForce 6600 series
NVIDIA GeForce 6800 series
NVIDIA GeForce 7300 series
NVIDIA GeForce 7600 series
NVIDIA GeForce 7800 series
NVIDIA GeForce 7900 series or better with latest manufacturer drivers.