No Ogg files means the editor won't see them, it is strangely not a bug but a design choice, ogg is the main format C2 supports, m4a is just a backup in case the ogg file cannot be read by the targetted browser/wrapper, both files are always required for full support though, but ogg is required for C2 to let you select the sound in the lists.
At least that is how it worked before, unless I misunderstood your question.
Also no capx to demonstrate which can result in a close bug.