Mannequins losing their postures

[pathscollide]

Hello and first of all, huge thanks to the creator of this fanstastic application. [:)]

I'm encountering a strange problem with mannequins. The ability to modify them, their posture, etc. is amazing. However, I have them grouped with other furniture and when I modify the group (for instance, renaming it, or simply making it invisible then visible again), the mannequins lose their posture and get all weirdly deformed (stretched out).

Has anyone encountered this and found a solution? Or is it a bug?

I'm using version 6.5.2.

Thanks