I still have the uv-index problem, another thing I see now is that units or scale for solar is not correct, scale is 0 - 100 (%), unit is W/m2. This problem is only for the last 7 days, last hour and last 24 hours are correct.
I have upgraded to WDL 6.09 and WD 10.37R Build 27.
I lost setup some weeks ago, due to power failure, and did not have a fresh backup after some configuration, so I did this more or less manually. But the WD-upgrade is done the last days.
Maybe I have lost something in the setup which I'm not able to see..