While I am using SDT 6.1, I found the line of code, but that is the only place I can find any reference to oCommonDialog. I would put This.oCommonDialog in the debugger watch window and set a break point on when its value changes. Hopefully, this will find and break where SDT attempts to initialize its value.

>VFP 7
>
>SDT version: 5.1j
>Error #: 1734
>Message: Property OCOMMONDIALOG is not found.
>Line #: 13
>Code: with This.oCommonDialog
>Method: getnewfile
>Object: frmSDT
>
>I don't recall what I did because this problem happened recently. What should I do to fix this?