Printing from Mozilla

I have problems with mozilla printing. For some reason when I try to print anything the Serif font is changed to Burnstown Dam. To anyone not familiar with this particular font it is not the easiest one to read - it looks like bits of wood nailed together. The San Serif substitute is readable but I am not sure which one it is. I don't think it has anything to do with kprinter because it occurs if I print to file and also if I bypass it all together and print with the lpr command. I suspect it has something to do with font encoding but I have had problems with mozilla printing before and don't want to start experimenting if this is easy to sort out. Any help appreciated. Nick