If you see no tooltip at all, on yourself or others please check the following:
Verify the addon is installed, enabled, and you are able to access the settings by typing /rio into your chat box.
Under the settings, please verify you have the correct faction and region checked off.
Make sure the option "Show Raider.IO Tooltip Info with Modifier" is UNCHECKED.
If the only data you see for yourself in your tooltip is your score please check the following:
Make sure you meet the minimum requirements to be shown in the addon.
Make sure you weren't removed from the addon due to inactivity.
After resolving the options above, please wait for the next addon update to be reincluded back into the addon.