When two methods are related via BINDEVENT() and flag 1, the return value should be of the delegate-method, not the source-method. That's what documentation for Vfp8 and Vfp9 says, and that's what Vfp8 and Vfp9-Beta are doing - BUT NO LONGER VFP9-FINAL!!!
Is there any vfp-wide setting I didn't catch or is it really an undocumented change of the syntax between the beta and the final version?

Try this:
x = createobject("aaa")
y = createobject("bbb")
bindevent(x,"metha",y,"methb",1)
? x.metha() && Vfp8 and Vfp9Beta return "BBB", Vfp9Final returns "AAA"

define class aaa as custom
procedure metha
return "AAA"
endproc
enddefine
define class bbb as custom
procedure methb
return "BBB"
endproc
enddefine