Hi Rob,
We were able to isolate this problem when a merge field in header/footer in result display mode does not show until leaving the header/footer using our latest 2013 Q1 official version. We have logged it for revision and will try to fix it soon.
Please, excuse us for the inconvenience. We have added Telerik points to your account for the report. Don't hesitate to contact us if you have other questions.
Regards,
Vasil
the Telerik team