I agree with you, we need to prevent the same test list from being scheduled twice at the same time. I've logged this as a feature request, you can track its progress here: Public URL
As for the second issue(from your last post), this strange behavior can be caused by a corrupted SQL database. Please try the following:
1. Close the Execution client.
2. Open the "Configure Scheduling Server" menu (see screenshots).
3. Create a new SQL database. To do this simply enter a new name for this database. The rest of the settings can remain the same.
4. Now try using scheduling again - the problem should be resolved.
If this doesn't help, please check out this article
and send us the Scheduling log. It's located here by default:
C:\Program Files (x86)\Telerik\Test Studio 2011.2\Bin\Telerik.TestStudio.Scheduling.Log.
Hope to hear from you soon!
the Telerik team
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