mime 9.4.1.0 vs 9.5.0.55

We discovered an issue on the mime part which we ONLY got to work with version 9.4.1.0. When decrypting a mime mail object no version before !!or after!! 9.4.1.0 can decrypt our mime. Using version 9.4.1 works just like expected

Decrypt:
    DllDate: Dec 29 2015
    ChilkatVersion: 9.5.0.55
    UnlockPrefix: XXXDEUSMIME
    Username: --------:-------
    Architecture: Little Endian; 32-bit
    Language: .NET 2.0
    VerboseLogging: 0
    decryptMime:
        unenvelope:
            loadPkcs7Der:
                der_to_xml:
                    (leaveContext)
                loadPkcs7Xml:
                    Pkcs7_EnvelopedData:
                        AlgorithmIdentifier_loadXml:
                            RC2_CBC
                            IV: K2gyn/LeD78=
                            KeyLength: 40
                            (leaveContext)
                        numRecipients: 1
                        RecipientInfo:
                            IssuerAndSerialNumber:
                                issuerCommonName: 
                                issuerCountry: XX
                                issuerState: 
                                issuerLocality: 
                                issuerOrganization: XXX
                                (leaveContext)
                            AlgorithmIdentifier_loadXml:
                                (leaveContext)
                            encryptedKeyNumBytes: 128
                            (leaveContext)
                        (leaveContext)
                    (leaveContext)
                (leaveContext)
            unEnvelope3:
                unEnvelope_encrypted:
                    findMatchingPrivateKeyFromSysCerts:
                        numRecipientInfos: 1
                        certSerialNumber: 00
                        certIssuerCN: 
                        subjectKeyIdentifier: 
                        findPrivateKey:
                            findCertificate:
                                findCertB:
                                    (leaveContext)
                                findCertBySerialAndIssuerCN:
                                    msFindMsCertBySerialAndIssuerCN:
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        openCertStore:
                                            (leaveContext)
                                        (leaveContext)
                                    (leaveContext)
                                (leaveContext)
                            (leaveContext)
                        findPrivateKey:
                            findCertificate:
                                findCertB:
                                    (leaveContext)
                                findCertBySerialAndIssuerCN:
                                    msFindMsCertBySerialAndIssuerCN:
                                        (leaveContext)
                                    (leaveContext)
                                (leaveContext)
                            (leaveContext)
                        (leaveContext)
                    No certificate with private key found.
                    (leaveContext)
                (leaveContext)
            Failed to unenvelope message
            (leaveContext)
        Failed.
        (leaveContext)
    Failed.
    (leaveContext)