In release Edit Relationships select "Create a new work"
1. Enter song name
2. Tab to "Language"
3. Press "Alt+Down" to open dropdown listbox
4. Type "Lat" to go to "Latvian"
5. Press Enter to select "Latvian" language
Instead of selecting element from list the new work is created with empty language.
Same problem with Type listbox when trying to set "Song".
Seems that this was working right before 2012-11-14, but I may be mistaken.
When editing work outside the Relationship editor it works as expected - the Enter with open listbox only confirms selection of active element.