Error-populating-Contribution-visualizer-in-build-15

How did you find build 15 ? My system shows that build 14 is the latest.

You can go to Backtest Settings in Preferences to disable that visualizer until Eugene can determine the conflict.

I tracked it down to StdDev indicator's changed signature. StdDev is used to power the ScoreCard and visualizers in the PowerPack. This change is related to a customer's request (added .Value method to RSquared and a choice for calculation method for StdDev/RSquared for Build 15):
https://www.wealth-lab.com/Discussion/RSquared-indicator-value-different-from-WL6-6565

Unfortunately, something went unplanned and the production version fails like you described. Today we are going to release four extension updates. So updating to upcoming PowerPack build 7 should fix the error.

Thanks Eugene!