I am using Blender 2.69 and trying to merge bones in an armature to meet the requirements of a specific target platform. As an example, the fingers have 4 bones and need to have 2 bones.
When I select 2 adjacent bones and alt-m and select merge, this sometimes works and sometimes does not. Cases where it fails seem to include one of the bones being offset from the rest of the armature. However the bones being merged form a chain so I would expect this to work.
Any information about when merge succeeds or fails and how to make it work would be welcome.