The TNSNames.ORA file was modified and some instances were added and removed. Opening a new Instance Manager window does not reflect the changes made to the TNSNames file. Also, the instance names do not appear in alphabetical order at times.
RESOLUTION 1:
Select View | Toad Options menu option.
Select DBA from the left side and check "Refresh Instance Manager database version during every poll" checkbox.
RESOLUTION 2:
Select View | Toad Options menu option.
Select Instance Manager from left side and click OK button (without making any changes).
The Instance Manager takes instance names from both the TNSNames and Connections.ini files.
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