Ok, so I made the reg fixes to allow tethering (in my Internet Sharing screen there is a drop-down for "Network" connection where I select "Sprint").
It was working great for a few days. But now when I click "Connect" in ICS, the status just changes to "Check USB cable connection". Now I plug in the phone (via usb) to the PC. The status never changes and it never connects.
I've rebooted both phone and PC and can't get it working again. And I can't really go back to Sprint and complain about this either (
)
When I plug in the phone via USB without ICS started, ActiveSync kicks in and does all it's syncing successfully, so I know the cable is good.
What gives???