Does it happen every time you try to open a task from within a ticket, or does it happen intermittently?
Do you still have your core osTicket installation? Does it happen there? (It may be an osTicket issue, unrelated to osTicket Awesome… I really have no way of knowing at this point).
If you want me to assist further, you can temporarily as me as an agent using email address info@osticketawesome.com. Make sure the Administrator option is checked.