Version Found: MIG 7 Series v2.3 Rev2
Version Resolved: See (Xilinx Answer 54025)
A MIG IP OOC Synthesis run goes out-of-date when validation is run on the block design containing it.
The MIG OOC Synthesis need not be re-run, it can be forced up-to-date from the "Design runs" window as shown below.
10/06/2014 - Initial Release