My Editor | Navigator box in the left side is empty when loading Packages or any PL/SQL code from a local file. I do not see my spec and body items in the left side and thus I could not jump around my Package. This problem started after I upgraded to Toad 10.0.0.41. My old Toad 18.104.22.168 did not have that problem.
1. Fully exit Toad
2. Go to your "C:\Documents and Settings\<your_user>\Application Data\Quest Software\Toad for Oracle\10.0\User Files" folder
3. Rename the Toad.ini file to Toad.ini.OLD
4. Start Toad
5. Re-test the issue