After upgrading or installing Toad 9.0.1, the user is not able to set break points at executable lines, and sometimes the options and actions are grayed out. For instance the user is only able to set a break point at the head of each procedure. User is licensed to use the debugger module.
Toad for Oracle is set to JDWP Debugger or Script Debugger.
Your debugger option is set to JDWP Debugger or Script Debugger. To change this, go to the Debug Menu and check off DBMS Debugger. In addition, you can also go into View |Options | Debugger | Select DBMS Debugger as the default debugger.