5.4 UPDATE BUG:

In 5.4 the unreal LODs system seems to create issues with the merging. If you have a merged wth multiple materials to avoid it being corrupted you have to simply remode and readd the last material as detailed described in the following steps:

• Open the newly merged skeletal mesh

• Hit Ctrl + C to copy the LAST material in the Material Slots array

• Delete the last material in the Slots Array

• Click (+) to add a new Slot in the Material Slots Array

• Paste the copied material in the newly created slot

1.1 Changelog:

• Fixed a crash when saving 2 meshes with the same name / path

• Fixed a crash when merging meshes with multiple overlapping UVs

• Added the Runtime merger wrapper to merge skeletal mesh at runtime