Hi,

I am currently working with quite a lage assembly with over 500 parts in it so Large Assembly Mode kicks in. When I go to open the assembly from the File > Recent list it automatically opens up in lightweight mode and the assembly always has failed mates when opening this way.

The question I have is that why does the assembly always contain failed mates when in lightweight?

Once everything is resolved the mates not longer fail so the only thing I can think of is that the assemby is using some flexible assemblys which is somehow causing problems.

Regards,