Strange Behavior with Callback

Hi all,
Ive a strange behavior. When an operator put a lead to callback later, in useronly mode, the lead not appear on his callback list or appear as a blank row and its impossible to access to call.
This problem is on only one operator, the rest work fine.
Any one know why???
Thank in advance!!!
Happy New Year!!!!
Ive a strange behavior. When an operator put a lead to callback later, in useronly mode, the lead not appear on his callback list or appear as a blank row and its impossible to access to call.
This problem is on only one operator, the rest work fine.
Any one know why???
Thank in advance!!!
Happy New Year!!!!