found some issues with keyframes/animation from 6.5
One thing you HAVE to do is make much more keyframes than you would normally do in LW; LW is very good/intelligent about guessing what you want to do, but Blitz is not. So if you rotate object for example you need to set only first and last keyframe in LW, but if you need .B3D you need AT LEAST add middle keyframe too so that Blitz rotates the thing right... and nulls are needed too for complex animations, so it might need more work and planning than "normal" LW work. But Convertor works, at least I have got good results (I'm using 7.x though).