A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
As requested, I have copied half of the data from my workbook into a new, test workbook. The new test workbook is able to show comments normally.
Consequently, I had tried this step before posting my question to this board and got the same results in both trials.
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Most (but not all) comments are being added to the cells while the column filters are applied. In other words, I filter columns A and B which leaves me with about 50 rows of filter results. I then add comments to the cells in columns G, H, I and J. After filtering and commenting as described, I notice previous comments added to cells in columns G, H, I and J (after different filters were applied to A and B) have disappeared.
It is not a matter of me adding comments to cells that already have comments. I am not over-writing comments. It always happens and only happens when I add comments to cells with no existing comments - after doing this, some cells with comments lose their comments.