Choose American English (or any other language) from the install, log in. You get a GDM_LANG/LANG setting of, e.g., en_US.utf8. Xlib requires en_US.UTF-8 to function correctly. I'm not sure if this is a locale.alias problem or there is supposed to be a translation of utf8 to UTF-8 in the GDM code. It worked correctly in 8.0
The gdm locale.alias does have "UTF-8" so there is something strange going on. (someday we really should just fix Xlib here...)
via email: I fixed it in CVS and it's in 2.4.1.1 so perhaps you're looking at the "fixed" version :) George
Taking GDM target/blockers.
Indeed seems to be fixed 2.4.1.1