Never edit your "live" post without a safety copy. Rename your working file (e.g., Post_v1_Edited.pst ) so you can always revert if the code breaks. Use the Post Debugger:
Some shops fall into the trap of "post editing as a workflow." If you are: mastercam post processor editing
The best post processor is invisible. You generate the code, press cycle start, and walk away. If you have to touch the G-code, you need to edit your post. Never edit your "live" post without a safety copy
You want an M01 (Optional Stop) followed by a probe routine after every tool. Solution: Edit the ptlchg$ section (tool change). Add: press cycle start