I am afraid I would need a little more details about the current configuration, as there could be many scenarios which requires different approaches to troubleshoot.
There are two very common scenario that I am thinking of, one which is when AJAX is enabled to update the Scheduler, the ToolTip, and there are two simultaneous requests sent to the server, where only the first completes. Another scenario is when AJAX is enabled but there are errors generated on the server but are hidden by AJAX. In such case, the error could cause the rest of the script controls stop operating any further.
Are you trying to create appointments using Drag and Drop
and then the application fails, or moving an existing on the top of another? If you could share the page markup and code behind, I'd be glad to take a look and assist you further.
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