What code is called in setbrop, line 580?

>Folks, since upgradingto VFP7, some of my prg options are throwing me out with a fatal error, an example below. I cant trace the cause. There have been no code changes since moving fromn VFP6. The VFP runtime library files are in the application folder rather than microsoft, common etc. Any clues? Denis
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>Error grave: código de excepción=C0000005 @ 01/04/2003 04:34:13 PM. Archivo de registro de errores: C:\BRAHMS5\VFP7Rerr.log
> Llamado desde - setbrop line 580 {C:\shared\prg\setbrop.prg setbrop.fxp}
> Llamado desde - rde line 109 {C:\BRAHMS5\prg\rdelib.prg rdelib.fxp}
> Llamado desde - menuexecute line 692 {C:\shared\prg\menus.prg menus.fxp}
> Llamado desde - runmenu line 36 {C:\shared\prg\menus.prg menus.fxp}
> Llamado desde - brahms5 line 765 {C:\BRAHMS5\brahms5.prg c:\brahms5\brahms5.exe}