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.
JimmyS1
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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.