Problem when associating Test Executions to a Test and a Defect to a TestRun

Steps do replicate the problems:

• On a JIRA Test issue, under Test Runs, click Execute In -> Existing Test Execution...
• Click on search for an issue
• Click Search
• The Search button will become inactive after being clicked, and won't be re-activated if a different query is typed in;
• When a valid search it's done, the Columns selector will appear. This shouldn't happen.

• Navigate to a Test Run page of a Manual Test with at least 1 step;
• Under Execution Defects click on Add Defects
• Click on search for an issue
• An endless spinner will be displayed;
• Refresh the Test Run page
• On one of the Test Steps, click on Defects -> Add Defects...
• Click on search for an issue
• An endless spinner will be displayed;