[@robin-w Moderator 11 years, 8 months ago]

ok, it’s caused by your themes style sheet

line 5600 says

.no-touch .reply {
  visibility: hidden;
}

and this is hiding bbpress reply

you could try adding

#bbpress-forums .no-touch .reply {
  visibility: visible !important;
}

to your css file

see

Functions files and child themes – explained !