Thank you for reaching us out.
Can you please elaborate more on the issue you experience - do you see the recorder toolbar attached to the WPF application? Or only the splash screen appears and the recording process does not proceed?
When saying no elements are detected in any WPF app do you mean you could not highlight any element
and locate it in the DOM tree? If you could record a short video it will be useful to better understand what might be failing.
You also mentioned the misbehavior can be observed when using Test Studio plugin in VS 2013 - have you tried to start the standalone application? Which is the version of Test Studio you are using?
Also you could try attaching the recorder to an already running application - please see the attached screenshot for reference.
Please let me know the above details to be able to continue the investigation. Thanks in advance!