You're now using 10.1.2?
Did you update your projects and events that where from prior to 10.1?
Please post screen shots of what's going on. Show us exactly where the folders Final Cut Projects and Final Cut Events are.
When you say you copied the projects what exactly did you copy? The currentevent file?
As I now have make some changes all I have done is copy it back into its original folder and try to open it.
Can you clarify what this means? How did you make changes when the currentevent file is outside the folder?
We can't see your computer so we have no idea what you're doing and what's happening on it. All I can say from your description is that this doesn't sound like something you should have done. It's possible the file is corrupted by doing this. It does sound like the projects and events need to be updated to the new version and that has not been done yet.