I was cutting a v-carve outline of a quilt block for my wife. I realized I had forgotten to secure the lower left clamp where the touch plate had been used. I hit the Stop button in Mach3, secured the clamp and restarted the program from the start since it hadn't cut very much. When it restarted i had lost about -.030" in X axis. This made the v-groove for part of the project almost twice as wide. My question is:
1. By hitting stop did I lose steps in the x-axis?
2. Should I have hit Feed Hold, then Stop or just the Emergency Stop?
3. What is the best practice for stopping and then restarting in that situation? I had written down the X,Y G54 coordinates at the start, but didn't recheck them.

FYI, I am running an 2 year old Avid Pro4848 with Nema34 and their integrated electronics kit.

Any thoughts would be appreciated. Thanks