I think that letter E is way overrated.. But, is keeping with the helpfulness of this community, just box that printer up and send it to me.. I'll do my best to correct your problem and if I can't fix it, I'll just take it to the computer landfill..
One possibility could be the fonts loaded in your printer. May want to see if there's an upgrade for them.
What DWF viewer are you using?? Hang on here, I'm thinking out loud.. Is this really small text on a large drawings by chance??
Try this, go into your dwf writer and change the paper size to something REALLY huge. Then create the .dwf.. I had this happen on the village of Bethel, AK where if I created a .dwf file and they zoomed into the block names, it was all garbled text.. Making the .dwf writer think I was plotting on larger paper forced it to write the test at a legible size.
One last thing. There's a .dwf writer that was mentioned in Cadalyst last month I think that ROCKS.. No $149 for a .dwf writer from AutoDesk.. That's the one I used to do the map of Bethel and it's suhWEET!!
Hope you can decipher somethin from my ramblings.. I'm afraid to go back and proof what all I said..