tanks stops moving

[i00b]

I've just bought (on Steam) and started playing MOW-AS. When I repair and use a German tank, after a while I can no longer move the tank to a new position. A yellow circle appears around the tank, I can use the cannon and machine gun. The tank does not have to be repaired. The tank does not need gas (i.e. to add gas I must first siphon gas and then pump the gas back in). Why can I no longer move the tank? This occurs with many of the German tanks I repair and use. Note my game play is slow, defensive and take considerably longer than videos I've seen on youtube. Can anyone explain what is happening and if there is a way to get the tanks moving again?

Thanks,

Ian


My system information:
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: To be filled by O.E.M.
System Model: To be filled by O.E.M.
BIOS: BIOS Date: 10/20/10 09:47:36 Ver: 08.00.10
Processor: AMD Phenom(tm) II X6 1045T Processor (6 CPUs), ~2.7GHz
Memory: 16384MB RAM
Available OS Memory: 16346MB RAM
Page File: 6738MB used, 25952MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 64bit Unicode