RPi 3B with sunlight sensor problems

Hi all,

I have a WeatherPi up and running for the past couple of years, as part of the OpenVino.org project.

wiki.costaflores.com/display/OP/The+Weather+Station
Openvino.org

...and now I am trying to add the SI1145 sunlight sensor. 

I managed to install the Adafruit_Python_PureIO module and i2cdetect sees the sensor:

mbarrow@openvinopi:~/light/Adafruit_Python_PureIO/SDL_Pi_SI1145-master $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77

But I am not getting any data from the sensor:

mbarrow@openvinopi:~/light/Adafruit_Python_PureIO/SDL_Pi_SI1145-master $ sudo python simpletest.py
Press Cntrl + Z to cancel
--------------------
Vis: 0
IR: 0
UV: 0
--------------------
Vis Lux: 0.0
IR Lux: 0.0
UV Index: 0.0
--------------------

If I disconnect VCC or Ground the script aborts, so it would seem like it is connecting to the sensor, but not reading any values.

What other ways can I troubleshoot this?

Thanks!

./mike