Hello Tanya and Craig,
This is concurrency issue, we are working on a resolution already. For the time being, if you want to use more than one process with the same application, you can use the application in NLB environment.
@Tanya, the setting can be changed from the application pool advanced options. Open IIS, select the application pool, click on advanced settings and the option is there, under Process model. Screenshot attached.
All the best,
the Telerik team
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