First Timer here and somewhat New User to AutoCad (3 Months). I'm using AutoCad 2008 for Design/Build with a Mechanical Company. I use alot of Blocks for Pipe Fittings from Charlotte Pipe and Foundry in the design stage and occasionally, I'll have to manipulate or edit one of the blocks to get the 2D view I need. After "Save As" (for example from '2 inch Sanitary Tee Front View' to '2 inch Sani Tee Top View') I try to insert the newly named block into my drawing but get the error message "2 Inch....Block References Itself *Invalid* and it won't load the block. Even opening a new drawing tells me the same error message. What am I doing wrong?