My-WeatherIndicator widget doesn't start in transparent mode.

I'm using Xubuntu 15.10, and I notice when I boot up the computer, the My-Weather Indicator widget will show up with a black background instead of a transparent one. This in noticeable when using allinone or Super themes. Had no problems when running MWI in Ubuntu-mate 15.04. If I go into the options menu & preferences & pick the allinone skin, it will pop up normally WITH transparent background. Tried fudging with all of the Composting options in Windows Manager Tweaks, but nothing helps.

Any ideas why this is happening? Thanks.