The past couple days I have been plagued by this error when opening drawings: "SOLIDWORKS encountered a problem in the file:"  It leaves the drawing corrupted where I can no longer open it.

I have tried opening the assembly and rebuilding it but it does not fix the drawing issue.  Does anyone know what might cause this?   I have found if I use the "pack and go" feature I can sometimes get the drawing to open if I remove all relations to other files.