Lion is not bad for Poser as such but I have heard that it is not good YET and other Poser version have not been compatible.

My Lirbraie stays inside Poser pro 2012 so I am not sure where the problem for Turtle comes from.

At the time I had Lion installed I was not aware and could not use Poser Pro 2010 any longer.

I might install Lion again once I am more at ease with Poser Pro 2012 though and got some more positive feedback about Lion.