My question is - do you have a button on this form that fires its Click method by pressing Enter (Default property of this button set to true).

This whole code in ARCC seems like a big kludge solving this strange anomaly you can not figure out the cause.

Alternatively, do you have a KeyPress event of the grid or form that may contribute to this behavior?

>I'm not sure what you're asking?
>
>In the meantime I believe I've solved the problem by changing the AfterRowColChange method to this:
>
>

>LPARAMETERS nColIndex
>LOCAL i AS INTEGER, cAlias AS STRING
>
>* I've always felt that the grid control is a bit temperamental and found that setting the controlsource to itself 
>* stabilizes it.  
>
>cAlias = ALIAS()    && added now
>TRY
>   WITH THIS
>      SELECT(.RECORDSOURCE)   && added now
>      .nActiveRow 			= .ACTIVEROW
>      .LastActiveCell[1,1] 	= .ACTIVEROW
>      .LastActiveCell[1,2] 	= .ACTIVECOLUMN
>      .lLastRow = .ACTIVEROW= RECCOUNT(.RECORDSOURCE)
>      FOR i = 1 TO .COLUMNCOUNT
>         .COLUMNS(i).CONTROLSOURCE = .COLUMNS(i).CONTROLSOURCE
>      ENDFOR
>      .REFRESH
>   ENDWITH
>CATCH TO oEx
>   oEx = NULL
>ENDTRY
>
>* added next three lines now although I'm not sure they are needed as long as ALIAS() is not empty.
>IF cAlias <> ''
>   SELECT (cAlias)
>ENDIF
>
>

>
>I'd appreciate your comments, if any.
>
>TIA
>
>Peter
>
>>>Hi Naomi,
>>>
>>>Thank's. Maybe your approach is the sounder one, although I can't offhand say why. I'll certainly give it a try.
>>>
>>>As to the try...catch, my thinking was that, if the replace, for whatever reason, were to cause an error, I don't want the whole app to fail.
>>>
>>>In the meantime I've narrowed the issue down: the enter on the checkbox for some reason causes the grids columncount to be set to zero. Why, I don't know.
>>>
>>Do you have a button on your form with Default property set to true?