Thanks!
What does it mean "Is the original-file unchanged, or is it cleared ?"
If I try to modify the content of my code file, the file appears to be changed, but attempts to save fails leaving a "*" on the tab of the file in CB editor. At the meantime, the .cbTemp file for my code file is created under the same directory to store the version before my modification. After I force to quit CB without saving, the .cbTemp file remains where it was.
The problem didn't happen with other editors, like gedit.