export of the chart to image (or pdf) will show an html code of non-breaking space in chart title and chart legend, but not in a label added to HtmlChartHolder
Declined with the following message - The issue is not reproducible with the latest UI for ASP.NET AJAX version 2016.2.607. You can try upgrading to this version. If, however, you are still observing this issue you can open a support ticket where you can provide a small runnable sample where the issue can be reproduced and examined further.