OK. Well, we had a problem with the core code and found a solution that resolved it for our situation. It would no doubt work for people with the same settings, but we currently do not have the resources to investigate further using condtional settings not applicable to ourselves, especially in the light of piloujp's last comment which seems to indicate that there is a long-standing issue on which a considerable amount of time has already been spent without achieving a full resolution.

Thank you for looking into this and please do as you wish with our report.