Please do report back.
I confirm the issues with left/right buttons on BT are solved. They updated the BT libraries for FW 1.11.
BUT

Occasionally, I'm having problems with my MIDDLE mouse button now (which was perfect). After release it stays "on" for what can be up to 1 or 2 seconds. Then it releases. My CAD rotates the model with the MMB, so this means the model keeps rotating beyond intention.
It might be related to heavy computational loads, because I think it only occurs when the fans are running full speed. I haven't been able to pinpoint it yet. When it happens, I can reproduce it in that mouse testing website.
I didn't notice it immediately after upgrading. It happens rather sparsely. But it's there. If I restart the computer it's gone.
But it would be nice if you could also keep an eye on this behaviour on your end...
Which computer are you using?
Best regards,