We have a dashboard with multiple canvasjs instances. If we display more than four charts at the same time and if at least two of them have x-labels, the axis options do not apply at one of the charts with x-labels after the first rendering.
It even seems to use another serif font instead of the theme4 standard font. After a browser resize (render update) everything is rendered fine. The y-axis options (with the same font) are not applied in this case too.