Query Extend not working in version 1515

When I select to filter a query I perform the following:

Select 'Filter query results' (Binoculars) from the top right hand of the query grid.
on the 'Reduce/Extend Search' form I select 'Reduce' from the drop down
I apply a filter to the records (in this case I selected an exact date of an attribute)
Filter works as expected and records with the date selected in the filter are returned.
I then wish to return the results to their original state (bring back all of the available records). In the past I have selected 'Extend' and left all of the filter criteria blank which would return all of the applicable records. In version 1515 the reduced record is the only record displayed when I perform this step. There appears to be no way to get all of the original records back.

I performed this test using MYSQL 5.5, IE, FF and Chrome - the results were the same every time. Appears to be a bug.

Have you refreshed the browser after updating?

I cleared the cache and it now returns results when I extend the search.