Hi David,
Thank you for being patience.
Are you using multiple threads in your application? Is the grid is being loaded from a separate thread? Please refer to the following demo sample which demonstrates loading the data in grid using a thread. Kindly try it and let us know if you need any further assistance.
Sample :
LoadingGGC_Thread.zipAlso refer to the following KB article for more details.
http://www.syncfusion.com/Support/article.aspx?id=572
Have a nice day.
Best regards,
Madhan