I would guess that ISX project got corrupted. Try to recreate it from scratch.

>I am building a distributable for a new VFP9 app (first VFP9 distributable). I get the following InstallShield error:
>
>"A record in the Property table is using string ID 'ID_STRING1' for column 'Value' but this string is blank and the column is not nullable. (-6264)"
>
>The error number link sends me to the following page:
>http://support.installshield.com/kb/view.asp?articleid=Q109067
>
>Resolution:
>

Select the Text and Messages view.

>

Select a dialog or message in the center column to display the strings.

>

Scroll through thea strings in the right panel and locate the string ID specified in the error message.

>

Enter a value for this string ID.

>

Rebuild the setup.

>
>The page is right on but I cannot find the string ID 'ID_STRING1' anywhere in the InstallShield dialogs to fix it.
>
>Has anybody seen this one before?