There are several possibilities:
Some other process changed the file and Eclipse hasn't refreshed the workspace. To check, select the file in question and choose "Refresh" from the context menu. This is probably not your problem but it's a common issue, so I wanted to mention it.
Also you settings here might be worth taking a look at
If neither of those help could you give me a few more details to help you out
- What leads you to believe that the CVSROOT/loginfo needs to be changed ?
- Does this happen all the time and if so has it been happening forever ?
- Exactly how are you committing your changes ? (Via the UI or command line)