Issue Update (3/16 9:30am):
We are testing a candidate fix for this issue currently with RIM. Once we have confirmation that the fix works for all BES MR versions we will set in motion the processes required to release an update to RU3. We will also provide guidance at that time for customers with respect to environments which already have RU3 installed.
On the topic of QA, we work very closely with partners and RIM in particular - our releases are tested in conjunction with RIM prior to going live every other month.
Unfortunately this particular scenario was not caught during that testing - we will be working with RIM to ensure the likelihood of this occurring again is minimized through updates to our joint processes.