amethst.. are you using luxrender rc2 or rc3?  if it's rc3 has it worked for you previously or is this your first render with it?  so far i've found a major bug with rc3 that i'm not happy with.  submitted it to lux and we'll see what gets done; but, with network renders; i've found that my slave computers stop sending file samples after the first send.  couple nights ago my laptop rendered for 45 minutes with no samples sent.