What might help would be to temporarily put a ON ERROR statement in you app so that the error routine isn't being run. Also placing your SET STEP ON as close to the area of code you want to examine might save you some problem too. Perhaps a Refresh() is firing over and over ???

>Hi Victor
>Thanks for replying.
>
>The debug screen flashes temporarily on the screen and the app continues to process through the required methods and stops correctly at the read event. The error event shows no errors. Initialially, I thought I had inadvertently changed the form properties, but everything appears ok.
>
>The form itself contains a number of controls, a pageframe and two grids. I am now wondering if it is something to do with one of the grids since I do quite a lot of resetting to the grid properties in one of the methods, resetting controlsources, linkmaster to child tables etc and perhaps it does not initialize correctly. Athough it does give the correct result on completion of the processing.
>
>
>Thanks Peter