Is there a quick fix for this, or should I have stock with Beta2?
remove the -kb from the options in startx and you should be fine
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I think you mean ADD -kb. There was no -kb, as another poster has noted, but adding it helped me.
Just change this line in /usr/X11R6/bin/startx:
defaultserverargs=" -nolisten tcp"
to:
defaultserverargs=" -nolisten tcp -kb"
and FN 1,2,3,4 all work now for me on Beta3!