I changed the Name property of my grid from Grid1 to Details as a desperate, unnecessary, attempt to see if I could reference my grid's refresh method...

Neither the grid, any of its columns etc. are set to read-only. To determine this, I checked the Properties window for Details - and ReadOnly is .F. Likewise I checked all the columns and their ReadOnly = .F. too.

The table can be edited in a browse that I added in the grid's Init method, so that would make me think the table is OK. And, no, the table is not included in the project (it is an excluded table).