A grayed out name typically means that the student has been set up but hasn't actually logged in (and/or accepted an invitation if they are at a different domain). If the student has logged in and/ or accepted an invite, this might mean that you were on the reports page before the student logged in. Because it won't refresh the page automatically, the student will been shown as grayed out.  If you just click on the uPAR logo and then back into the reports it should pull the status again and the report should be there.