In the Concept Set Editor:

When looking at the concepts that were selected in the Concept Set (ie: the concept set expression) or in the included concepts tab, if you click on a concept, you will get 'Concept not found'. However, searching for a concept and clicking from those search results does lead to the 'concept detail' view.

Steps to reproduce:

1. Open existing concept set with several concept items in it. In this example, we will open one from a cohort definition, by clicking 'edit' on the concept set.
2. In the 'Selected Tab', clkcik on one of the concepts. Observe: Concept Not Found. Also note: there is no way to get out of the 'Concept Not Found' result, you have to close the concept set dialog.
3. Also note same problem if you click on the concept from the Included Concepts tab.
4. However, if you go to the Search tab and search for the concept name that resulted in Concept Not Found (from 2 or 3), you will be able to click the concept on the search results tab.