I am having a similar issue. Attached references are showing up white. When I select an object within a reference, then ust the info button to list the object properties, they show up correctly yet on the screen the objects display only as white and also without any weight, (0 weight only). also, when I open with a newer version, I have the same problems. However, some references show up with the correct color and weight, but when i try to copy objects out of the reference into the current drawing, the objects go back to white/weight 0, but still list as the correct color and weight.
any suggestions are greatly appreciated!
Ryan