The new June 2018 update for Web AppBuilder seems to have brought on some major changes that have affected the way I must utilize some widgets. The Chart Widget in particular has started doing something it hadn't done before and I haven't been able to find a remedy for it.
Charts have added a 'Series0:' string to the beginning of each count result when you drag your mouse over any Chart Type when the Chart Display is 'Display Feature Counts by Category'. That said the filter is running otherwise correctly and bringing up the right count after the Series0: string.
I and others can live with it, but it would be nice if I could find a way to remove it.