I have two workbooks which have comments on a few of their cells.
As is appropriate, when I point to each of those cells the comments they
contain appear alongside.
But often (not always), after I have saved the workbook then opened it
up again on my return, I find that none of my comments appears when I point
at it.
Comments can be made visible again by selecting any cell containing a
comment, clicking Insert -- Edit Comment, then exiting without changing
anything. All comments on that worksheet are now available to me.
Next time I return to the workbook my comments may be available - or,
equally, they may not.
Can anyone explain to me what is happening here, please?

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DB.