This is a known issue that may show up in Clock Domain Crossing reports, but it will not manifest any issues in hardware due to how the impacted signals are used in the design. An RTL fix will be available in the next release of the core. There is no functional implication on the core due to this issue and hence the issue can be ignored. However, it is recommended to update the core with the next release in 2013.2, which will have the updated wrapper with CDC fix and other enhancements.
Note: "Version Found" refers to the version where the problem was first discovered. The problem might also exist in earlier versions, but no specific testing has been performed to verify earlier versions.
04/15/2013 - Initial release 06/11/2013 - Added information on 2013.2 release.