Missing legend when saving image

[lbwfff]

Hi,
Thanks for the tool, I have some problems while saving the image, below is my code:

pdf("cbn_electrontransport.pdf",width = 8,height = 6)
bngeneplot(results = pwayGO,exp = cbnexp, # expSample = incSample,
           pathNum = 28, R = 50, showDir = T,interactive =T,
           convertSymbol = T,expRow = "ENSEMBL", hub=5,strThresh = 0.7)
dev.off()

I found that the legend and title are missing in the saved picture, why does this happen and how can I solve it.

Thanks,
LeeLee