I had the same problem. Every time I would try to paste something from another file it would give me all that substitution stuff and return to the crosshair cursor. Could not even draw a new object in another file and paste it into the drawing. Found out that if I would close the file & AutoCAD - start up AutoCAD again - reopen the file it would work and if it stopped working again at another point, when I would reopen it - it would work. I have been using AutoCAD since R13 and am currently on 2014 since it was released and never had this problem until today.
I am working in 2014 –
The problem started when I was trying to copy / paste from another architects CAD file.
If I start a new file I can paste 1 time into it and that is it. After the 1st time this is what I get:
Command: PC
PASTECLIP Duplicate definition of block _Oblique ignored.
Substituting [simplex.shx] for [archquik.shx].
Substituting [simplex.shx] for [Univers Condensed].
Specify insertion point:
When I pick the point the command ends but nothing was pasted. I have purged the files and tried everything I can think of. This is only the case with files that I have copied objects from that Architect. My in-house files are fine unless I paste objects from that Architect in them –then paste no longer works. I have changed every object to layers to that are in my file and exploded all blocks prior to copying. I can’t even create a new object and copy/paste in the same file after I pasted from the Architects.