We have recently upgraded from TD 8.0 to QC 9.0

when i am trying to link a test run to a defect then i am getting the following message"You dont have enough grants to execute this action"

Although when i view the permissions for the group "QA Tester" the "Add defect link" is checked in QC 9.0

still i am getting this message.the same user was successful in TD 8.0.

We see this behaviour only after upgrade.