Encrypted disk images aren't opening

I recently got this Core2Duo iMac, installed Snow Leopard, then migrated all my users and settings over from my G4 PB running Leopard. Since then I've found that my encrypted dmg's (in a Dropbox folder) won't open - I enter what I know to be the correct password but the password dialogue box just keeps reappearing as if the password is wrong.
I've noticed this is now also the case with the same folders on the G4. However, I managed to open them eventually on the G4 and copied the unencrypted folders onto a memory stick. On the iMac I used SL's Disk Utility to create new encrypted dmg's from the folders on the memory stick, and wrote them to the stick.
All seemed to go well (this time I encrypted them with "Save password to Keychain"). However, when I tried to open the dmg's on the memory stick, the same thing happened! The password box wouldn't dismiss. This time I checked in Keychain Utility, and I was definitely entering the correct password.
What's gone wrong?

Ferd II wrote:
Orange Marlin,
1. How do you change the password?
Click on the image in the left pane of Disk Utility, and choose>Disk Image>Images>Change Password...
Do I copy both the disk image and sparsebundle?
Copy the entire Disk Image. Password lock will remain valid for all enclosed files.
;~)
Thanks!

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