'Shape' is illegal.... trying to resolve Failed.

Hi,


I have an ACAD model (.DWG) that has been corrupted since I last saved.  I am unable to open this model.

I have run a RECOVER on the DWG to enable me to open the model, but that appears to damaged the ProSteel logic.  Now when I attempt to re-open the DWG (after saving after the RECOVER) - it seems it is trying to re-reference each shape profile within the model, and is taking a very long time to open.

Occasionally (while opening the DWG) I will be presented with a dialogue box asking me to select an 'illegal' shape profile.


My questions are:

1.  Why is it that some shapes are automatically resolved (success) but some are not (failed)?

2.  What can I do to enable more shapes to be automatically resolved (something in the shape database?)?

3.  How can I avoid this hassle in the future?  Sometimes a RECOVER is the only way to restore a corrupt DWG, will it always result in this loss of reference?


Thanks for any help.

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