There are a couple things you can check. First my assumptions:
1. Using P&E USB ColdFire Multilink
2. Using example software.
Check the following:
1. Any other versions of Codewarrior installed?
2. CFFlasher and Codewarrior not running at the same time.
3. In your project settings under Debugger-> Remote Debugging in the Connection drop down box check to make sure USB is selected.
4. Try reinstalling the drivers for the P&E Multilink from
www.pemicro.com.
I hope this helps
.