I'm experiencing the same exact problem. The same issue is also being seen when running the program itself, not only in the registration screen. Apparently the font that it wants to use appears as only rectangles.
-- After starting eagle the registration window has broken fonts https://launchpad.net/bugs/60184 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs