Docking Station Not Working

I have a Dell Precision M4800, only a few months old. My docking station is a Dell E-Port Plus II, which came with the computer. Very recently, after an update to Dell Command Power Manager, whenever I dock my laptop to the docking station, Dell Command Power Manager will say 'The power adapter attached to your docking station is not recognized', and my system will run slowly. I have a power cord separate from the docking station that, when I plug in, will charge the laptop just fine. I am using Windows 7. What should I do? Is it the Dell Command Power Manager's failure?