I have a drawing which I cant open. Yesterday on saving the drawing, a dialouge box came up saying access is denied, and it wouldnt save. I then hit save as, and just saved it over the original drawing and that done the trick. But today it was the same thing, only on exiting the drawing I cannot re open it, the drawing file is still there, but wont let me open it. Has anyone else experienced similar problems, i dont know is it software related or network related.