Adobe Digital Editions not displaying embedded fonts correctly

Hi, I've been using ADE for several years to test and display our finished ePubs for clients. Just recently ADE has quit displaying embedded title and chapter title fonts in the viewed ePub. And reverts to some alternative fonts. This is very irritating. And it has happened with several books now. For instance if I embed "League Gothic" the font embeds on pdfs, it shows up in mobi files we create, but unlike before when I could view the ePub in all of its glory, the title fonts revert to some other common font.

Please help!

Cyrus