This challenge is occurring in both 1.5.3 and on the 1.6 test server at remote-learner.

Here is the Scenario:

I create a matching questions that asks students to put the months in the correct order, so the student matches the Month name with the correct number:

January -1
Feb - 2
March - 3
April - 4

But lets say when I created the question I accidentally put them in the wrong order and entered:

January -2
Feb - 1
March - 3
April - 4

Ooops...after the students have finished taking the quiz I realize my error so I edit the matching question matches so they look like this:

January -1
Feb - 2
March - 3
April - 4

I save and select regrade attempts and the attempts ARE NOT regraded. Nothing changes. The students who answered the question correctly but got 50% credit because the instructor accidentally had the wrong matching question still are only getting 50% credit.

What gives? When you adjust the Multiple Choice or T/F question it regrades and gives the students the correct points based on your edit.

I see in 1.6 that you can manually override but that is not an option in 1.5.3 and could take A LOT of time to manually override every single student attempt.