>IIRC, going from VFP 7 to 6, caused some problems if you had opened the menus in VFP 7 Menu Designer. VFP 7 changed the menu structure to support the picture clause. There was no reverse to the change, you had to rebuild your menus in VFP 6. The same would be true for going from VFP 8 to 6.
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Menu can be converted from VFP7/8 back to VFP6. See HOWTO: Convert a Visual FoxPro 7.0 Menu to a Visual FoxPro 6.0 Format mskb #320266.