sync pair encryption password is missing

[fentoncrossing]

Recently, my passwords used to encrypt sync pairs have been deleted. The cause of the deletion is not known. I suspect Windows involvement since the passwords are stored in the registry but I have no evidence to prove that. The consequence is that all of the data that is being synced to the cloud is now being synced unencrypted. What solutions or workarounds can someone suggest to help with this problem. Without the encryption, the tool is not useful for me in this case.