>>So if Column.ReadOnly is the setting that actually controls this, then what exactly is the purpose/use of Grid.ReadOnly? It seems that the COLUMN is is control of this, right?
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>I think, if I understand the issue, it also depends on the cursor to which the grid is bound. Because I did have cases where the Grid.ReadOnly worked without having to set each column ReadOnly to .T. But I never took the time to pin-point exactly why it worked in some cases and didn't in others. Where it didn't work, I just called .SetAll("ReadOnly") to make it work.

I agree with Matt - seems like column's ReadOnly takes precedance over grid's ReadOnly.