Those hubs are made vary cheaply with low quality components. They where never designed for the USB miners specifically.
The 49port ones on bay are made by ASICMINER for USB Block erupters... Same company made the original 333-336 usb miners. Orange/Blue hub jobbers. The Original 49er was a different company and very expensive made for charging stations and is grey in color.
But what I need is a link to the software to change the serial numbers so they can be indivudualy chosen other than by com port number.