6.7 Causing loopback address changes and interface swapping.

Upgraded our Router Board lab and found many suggestive issues afterwards. All loopback interfaces changed by 1 in the third octet, and many interfaces had swapped ip addresses. For instance, ether 3 would have ether 4 config, ether 5 would have ether 2 config, etc, etc.. Has anyone encountered these issues? Is it strictly an OS issue or some type of firmware issue? Thanks.