Tabs are converted into spaces. (4283565)

When executing a script with tabs defining indentations in a database tool, the tabs are converted into spaces instead of indentations.
 

WORKAROUND 1:
Use the Convert spaces to tabs option.

WORKAROUND 2:
From View menu, select Preferences -> Code Editor.
Check the option "Use TAB characters".

Also, it might be best to specify the option to show the TAB chars.
To do this, Right click in the Code Editor and select Edit -> Show Tabs\Eol\Eof
Restart SQL Nav and open the script.
Your script should now show the TABS and you should be able to run it.

STATUS:
Waiting for fix in a future release Sql Navigator for Oracle.