Yes, I am aware of it. Peter has already clarified the issue above. What matters is the intent. One friend of mine switched jobs less than a month after obtaining his GC and he didn't run into any issue whatsoever.

"No, you are not stuck at all. As long as your intent - and the intent of your employer - at the time that your green card application was filed was to work for the company in the sponsored position, you can leave at any time after getting your green card."