I've never had any problems with cobs saved by LithUnwrap (and all my models these days get saved as cobs from LithUnwrap) that were caused by LithUnwrap. And chances are, a lot of the problems people have had were not caused by LithUnwrap but by not doing something else they should have. For instance, making the hierarchy in TrueSpace can keep a model from getting converted, keep turrets from showing up as turrets, or cause a model to crash FRED2 when tried. If you take a cob just saved by LithUnwrap and try to convert it with PCS, then you probably will have problems, due to the lack of a good hierarchy. (LithUnwrap saves really bad hierarchies.)