Hi James,
Thanks for contacting Syncfusion Support.
We have analyzed your query and replicated in our sample but we are unable to reproduce the issue.
We have used two buttons for the ajax calls.
On clicking the hide chart the chart is hidden
Screenshot:
Hiding the chart
On clicking the display chart button the chart is shown
Screenshot:
On rotating the displayed chart
We have attached the sample for your reference
Sample Link:
http://www.syncfusion.com/downloads/support/forum/121249/ze/Ajax_calls268398387
If you still have any concern, kindly revert back to us by modifying the attached sample along with the replication procedure.
We would also like to know the version of the Essential studio in which the issue is reproduced.
This will be helpful for us to find and fix the issue sooner.
Please let us know if you have any concerns.
Regards,
Deepaa.