so basically i normally use autocad 2009. early this week i had to use 2010 working on the same file. im now back to 2009 and even though ive saved it as a 2007 file it wont let me paste anything into the drawing. it says that it is invalid. is there a way around this at all?
ive attached a screenshot of the message that appears when loading up also.
any help with this would be great.