|Is this a draft n router or is it the ratified n router? By n I mean 802.11n.|
Router manufacturers in their rush to get the n class routers out to customers took a guess at what the standards would be like and hoped that once the n standard was ratified they could issue a firmware update.
This did not go so smoothly. So you have n class routers out there some of which are working to a draft n standard and some to the fully ratified n standard.
At a guess it could be this that might be causing backward compatibility issues with different manufacturers adapters being used with the router.
I do not know what the solution could be other than using same manufacturer adapters.
wanderers points are also worth looking into.
☺ When everything else fails, read the instructions.