ADMIN > SETTINGS > PRIVATE MESSAGE is where I would start. See if you accidentally turned off "Save Sent PMs".
If it is set to YES, use some test accounts to see if they are actually being sent, or if it is a save sent issue. Try Admin account, Non admin account, and Super admin account provided you have access to all these types. Try sending and receiving to and from all three in an attempt to localize the issue.
Let us know the results and we will move forward.
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