Yeah, i suppose it depends on how you create the rig, Blenders great, but combined with rigs and GameGuru things can get a little crazy.
While i'm talking about blender/bones/gameguru acting crazy, another quick tip (something i noticed that you seem to do yourself so more a tip for others not you), when using blender to created rigged characters, mainly for mechanical type entities like robots etc.
You will be tempted to create your "robot" with each limb and joint as a separate object within the mesh (it's easier to make a multi-part model that way) however with rigged entities coming from Blender it's best to try to use single meshes using vertex groups to assign bones to limbs.
For some reason a multi-object mesh with bones when imported into GameGuru (in some cases, it doesn't always which is why it's annoying) will literally fall apart when placed in the editor, with all its parts scattered on the ground. It drove me crazy when i made my first mech and every time i imported it it appeared in the editor in pieces lol.
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