we checked this in detail and here is what happens:
When you set the filter, it resets the rows and the data source sets the cell to -1/-1
causing the DataGridView to validate the current cell, but the data source is null.
It´s logged as WJ-8404, fixed and will be included in the next release.
At the moment I solved with your precious advice.
I look forward to further details.
My application, which I am translating from a WindowsForm, is quite complex (custom datgridview, custom event, etc) and I would not want to avoid other problems due to the bug.
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