Problem
I am not able to see tempo dropdown after upgrading Tempo Timesheets.
Solution
To be able to see Tempo dropdown you need to have permission to access Tempo Timesheets or other Tempo products. You can grant yourself, and your users, this permission by going to JIRA Administration → System → Global permissions → Tempo Timesheets access (and/or Tempo Planner access, Tempo Budgets access).