i need help to fix this "Copy to clipboard Failed" is appearing on my screen everytime i try to copy some blocks or object. And everytime time i want to save the drawing it also appear "One or more object  in this drawing cannot be saved to the specified format. The operation was not completed and no file was created" Im using Autocad 2010.

What type of blocks or objects are you trying to copy and paste?
Were they created by you, in Autocad, or were they created by someone else, using a different program?
 
What format are you trying to save to?

it was created by autocad in our site office...it just a normal text & blocks...i guest it was a BUG...actually i solve it already what i did is i save it as a .dxf file and then save it to .dwg...now it works fine....
i will take this opportunity cad64... i modify an attributes and add some new text on it then when i use the attsync command all of the text/attributes dis appear...(it was made by our client & we want some changes) pls. help! what i will do?