Hi Anthony, I don't know why you are experiencing this problem. I sometimes insert Fill-Ins after Easy Recording and I've just tried erasing some, from a sequence which was recorded using realtime Fill-Ins and Post-Recording Fill-Ins. All the Fill-Ins were deleted successfully.
Sorry, I can't be of much help. From what you say, you seem to be using the correct procedure. The only difference between the procedure you use and my procedure is that I don't use the 'Panel Write' after deleting the Fill-Ins - maybe worth a try???

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Willum