Hello Sanjith,
Thanks for the quick response and sample application sent.
Through testing against your sample, I was able to identify the issue, and resolve my problem.
The issue occurred in my case when there were 2 or more charts on the same form, connecting to the same internal LS data source (not using json string). Only the last chart being rendered will show. To resolve, I had to add a new data connection for each chart.
Thanks for the help, and keep up the great support and Lightswitch controls! Lightswitch rocks!