Hello,
It seems that refreshing the page before the dragged task is not being dropped yet causes a JavaScript error that freezes the page. I would recommend to stop the timer while user is dragging the current task and start it again once the user drops that task on the RadScheduler control.
In
this form thread you may find a very similar scenario and a sample project that demonstrates the mentioned approach.
Regards,
Boyan Dimitrov
the Telerik team
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