Sometimes when I am debugging a test, a step is trying to locate an element but could not find it so I update the element during the test run.  

When I get to point of letting the test fail so I could apply the updates to the elements, I get to the Apply test Update window and click Apply, I get this error. 

System.ArgumentOutofRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.ThrowHelper.ThrowArgumentOutofRangeException() at Artoftest.webaii.design.execution.findexceptionupdateinfo.applyupdate() at ArtofTest.webaii.design.ui.executionupdates.onpreprompt(dialogresultprompt).

These "updates" do not get applied...There is another error I get fairly regularly that occurs on the same window and does get applied even though it says there was an error.  I will try to get a screencast of that error.

http://screencast.com/t/sRJfUYM5uuTV