Hi DebraZ
What version of Ledger are you using? If it is 9.0 or higher, there is no need to copy the GL data before performing Year End because with the exception of unpurged posting journals the old data is still preserved after Year End in the live dataset. You just need to make a backup under File | Backup.
However, if you want you can still copy the data as you are accustomed and nothing has changed.
I suspect that you are trying to open up a 9.0 GL dataset using the 8.1 GL shortcut. Make sure you are using the 9.0 GL shortcut. The other possibility is that when you copied the data you didn't copy all of the files, possibly because some were in use and you didn't realize it.
But again, tell us the version.
Steve