Hi Brian ,
It is hard to trace why this issue is arising without seeing it in a live application. We have searched our support database for any mention of this problem, and your incident was the only hit. This is a new one for us.
Is there any possible way for you to provide us with a sample that shows this exception? Can you reproduce it in one of our samples/attached sample? It will be easier for us to have a closer look into the problem and to resolve it.
Here is our test application.
http://websamples.syncfusion.com/samples/Tools.Windows/F70439/main.htmWe appreciate your patience, and Thank you for the interest shown in syncfusion Product.
Kindly let us know if you have any questions regarding this issue. We will be glad to assist you.
Best regards,
Nagaraj