Monge,
Idea (1):
This may seem stupid, but I have to try it.
Have tried just making a new drawing of the model?
1) Open the assembly model.
2) Start a new drawing like you normally would.
3) Insert the assembly into the drawing.
4) Save the assembly drawing under whatever name you want & put it in a file folder of your chosing.
Note: Before you save it check the reference box at the bottom of the sub-menu and see if it is giving the correct path.
5) Now close everything.
6) Now open your drawing and see if it stayed attached to the model.
I'm curious to know where the drawing is loosing it's reference to the model at. This one may help distinguish what and where the problem exists.
Idea (2):
When your in the drawing that will not reference the model. Tell me, in the Feature Manager Tree (FMT) try right clicking the first item in the list? (Should be the file name) A sub menu shows up tell me what is checked there. This is what is checked in mine
1) Automatic view update
2) Link to external dim text
If niether one of these are checked, turn them on and let me know if that helped
Question(1):
Can you right click a view and open the model?
Question(2):
Can you do the same as Question(1) except go through the FMT Drawing views and open the model?
Is there a possiblility that I could see the files that are causing you such pain?
I'm trying, bear with me. Scott Baugh, CSWP

George Koch Sons,LLC
Evansville, IN 47714
sjb@kochllc.com