A possible cause for this is the upgrade process setting the report's status to "On-Hold".
To rectify this please follow the steps below:
Go to Options
Then System Maintenance
Click System Settings and then General System Settings
Use the down arrow to go to the next page of options and select HTML Document Settings
Open HTML Document Maintenance
Locate the relevant report you are missing and enter Modify mode by pressing Ctrl + M on your keyboard, and then ensure the tickbox under 'Main Menu' is ticked.
Exit
