I just spoke to Apple Support and this particular tech, I was her first call that shes had regarding an issue with the hotspot no longer working... Hopefully they start to hear it from more and more people to release a patch on fixing this issue. Definitely frustrating.

Update... I was able to successfully connect my Surface Pro 3 via Bluetooth by joining it through a "Personal Area Network." Not sure if this process is the same with every laptop, but worth a shot. Didn't have to update any wifi drivers... Make sure you are connected via bluetooth to the device in question. Right click the bluetooth icon and select "Join a Personal Area Network" Select your device Select "Connect to device network" My wifi icon changed from the standard signal bars to a "plug & screen" icon. Hope this helps.