I have tried on front abd rear usb and the same problem with my wifi usb on BH 2.0.1.Pleace help me.On BH 1.7.9 was all ok.Have you tried it with the USB on front or rear ?
If on rear USB use an USB extension cord .
due to noise interferance , found a good location for dongle.
But now working perfect with USB extension cord .
I see 15 different my neighbors wireles networks
Im using Vu+ Wireless dongle with RTL8192cu and I had a similar problem.