Bluetooth Windows 7 USB port problem

Hi,
I am using a class 1 bluetooth dongle (unkown manufacturer) with the toshiba bluetooth stack V 8.00.03 Premium, and a bluetooth headset. The specs for the dongle are : Bluetooth V1.2, USB compatible with V1.2/2.0
I have a strange problem when changing the USB the dongle is plugged into. If I change the dongle to another USB port, searching for devices fails. I have tried uninstalling the stack, and of course deleting the device from the bluetooth manager window.
Also, strangely , when I plug the dongle into a USB extension on the same port, it doesnt work either. When I put the dongle back into the same USB port it works fine as usual.
I want to change the USB port so that I can get better reception , as its plugged in at the back at the moment. Also, I want to use the usb extension for the same reason, to bring it out above the desk. Weirdly though,as I say, it doesnt work with the extension (just a regular cable with USB male on one end and female on the other to plug the dongle into.
Is this something to do with voltage drop down a cable? And regarding the changing of the usb ports is this something to do with the bluetooth ports being installed on that USB port only? I dont know exactly how bluetooth ports work so, how they get installed etc.
Thanks very much for any help.

Few questions at the beginning:
Do you use Toshiba notebook?
I ask this because, as far as I know, Toshiba supports BT stack on Toshiba notebooks but if you get it as part of package of some other manufacturer they are responsible for support and functionality.
Until now Ive always used Toshiba notebooks and there is no problem with BT device so I cannot say much about your problem but what you can try is to remove preinstalled software, clean u the registry and after notebook/PC restart install Toshiba BT stack but put BT dongle in the port that you want to use now.

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