openpli 8.3 won't let me transfer files out..

i run two VU+ Solo 2 boxes in the house normally i can use FlashFXP 5 to transfer films tv progams etc from one to another. i was using openspa image on them and could move files quite easy..now i have changed one of those boxes to OpenPli i cannot tranfer any files from openpli with FlashFXP it just wont let me do it ..question is does anyon know why it wont let me????