We're seeing the same issue here. If you 'edit' the sub-assy you get the red cross but no info, the only way to find out the problem is to 'open' the sub-assy, however, when you have large assy's with many sub-assy's it is a royal pain to have to open each one to find the problem. If the doctor knows something is wrong he should be able to specify what and where it is.
I would attach a file but ours are very large, I don't think it will let me.
As a side note, we would like to see the doctor(picture) go away, he is annoying.