Hey Eric:
That was not my issue - I stopped the program - mid-stream, moved to XY, loaded a new file (same one with an additional tool path). When it switched to the first bit it fell through (bit the dust). Note, that would be the only time I did not have a tool height check (set to always) in between programs because support suggested I always put my tool away when finished (start with tool 0). It did do a position check (X,Y, & Z) - set to always.
Does that make any sense?
I broke the holder after surfacing, then tramming, and then forgetting to reset my tool holders. Pretty sure that issue was resolved after the light went off.
Kim