Able to connect to the database within Toad, but when opening the Schema Browser the following error occurs:
Unknown error: ORA-65535
Able to click OK, but any other tabs or drop-down chosen such as Procedures will invoke the same error.
If using an Instant client setup, try a different version available to test with. For example: If using an 126.96.36.199 Instant client setup where the issue is present, remove that version and setup an 188.8.131.52 version and re-test the issue.
If using an Instant client setup; try using a full version client instead and make sure to remove the instant client and all variables setup, prior.
If using a full client; try using an instant client of another version. For example if using a 10g full client, try an 11.2.x instant client.