I use Fedora 16 now, but this issue already was in Fedora 15 before I upgraded it.
When I lock my screen and then want to unlock it, I have a default English layout (I am from Russia and also have Russian layout). My layout switching shortcut is Ctrl+Shift.
When I try to enter my password, I get a login failure, and I must switch layouts twice (to Russian and again to English), and then login is successful. How can I fix this issue?