Hovering over this field ($$plsql_unit) gives a hourglass and the debugger hangs. Restarting Toad is the only option.
To reproduce the problem please follow the steps below:
1. Log into the database
2. Create the following procedure
CREATE OR REPLACE PROCEDURE my_proc
IS
BEGIN
DBMS_OUTPUT.put_line ('Line number: '
|| $$plsql_line);
DBMS_OUTPUT.put_line ('Unit: '
|| $$plsql_unit
);
END;
/
3. Add a breakpoint on line 6 and debug.
4. Hover over the field ($$plsql_unit) : Toad hangs.