Grades Disappearing from Rubric in SpeedGrader

[nataliet]

I created a weekly assignment where students resubmit to the same assignment each week to create a digital portfolio in one assignment.  In the past, I could look at the most recent and previous submissions and grade them in the single rubric in one extended grading session. 

With the current version of SpeedGrader, if I input grades/comments in the rubric and then look at another submission, the grades/comments disappear and cannot be retrieved.  I hope this description is clear.  I've resorted to grading on two computers simultaneously - one to look at the submissions, one to enter grades.  It's a pain.  

Any thoughts on what is causing this issue?