Hi,  I have recently reinstalled autocad 2010 due to a nasty reoccuring error and now it appears i have lost the replace block command.  I can type the command and it works fine but i need to have it on the ribbon for easy access and can't seem to find it in the cui configure box
 
any1 had similar problems? any1 know what to do to get the button back?
 
Ta

BlockReplace is an Express Tools command so make sure you have Express Tools installed (setup option) and their CUI file loaded (CUILOAD).