Microbit build issues

I've put 1.99 on a Microbit. I'm having issues connecting over serial - I can't - from a Macbook with OSX 10.11.6

I can connect over Web Bluetooth, but can't upload anything. Though the same code pasted into the console works fine over Web BT.

On upload an example error response is :

>Uncaught Error: Function "setTimeZone" not found!
 at line 1 col 27
setTime(1530126694.283);E.setTimeZone(1)­
                          ^
New interpreter error: FIFO_FULL