I just bought and installed a LiDE 400 Scanner. The autoscan button worked fine for about 30 scans and then even when I pushed that button, it keeps giving me pdfs instead. I tried unplugging, switching the port on my computer, rebooting my computer,...
Sorry to hear you are also having this problem. I returned the one I initially bought and have just received a new one. Will see if I have the same problem with the second one!