Problem with rekordbox 4.08 setting/adjusting beat grid not possible

Hey there,

For some reason it wont let me adjust where the beat grid starts, the button for it is faded and not clickable.  It randomly worked for one out of the 10 songs, yet after i changed it and wanted to adjust it again it wont let me. My question is why wont it let me adjust the beginning of the beat grid all the time?  Especially because where it automatically starts is in the wrong spot a lot of the time.  will this effect how it comes up on cdj's?  if so this is gunna be frustrating for my upcoming shows.  Pleas get back to me.

Thanks

-Nathan