I have been informed of a strange thing, and verified it myself: Some time ago the PRS-505 stopped displaying non-embedded sans-serif and monospace fonts in LRF files, replacing them with a serif font. The fonts are still on the device, and at least sans-serif is definitely working fine (because it is used by the Reader's UI), but they don't work in the books themselves. I suspect it might be a regression in 1.1 firmware, as I tried some books from my early days which used to display both monospace and sans-serif just fine, but they don't anymore. Could anyone please check it out? I have a tiny test book
here (it was intended to check for east-european support, but it can just as well be used for font-family tests).