I have seen several cases where a message is displayed when accessing WEBGUI, Personas or any ITS-based service:
There are cases where, upon investigation (using Fiddler, HttpWatch), the rendering version from the kernel did not match the one from the MIMEs. In one example, looking inside the trace, the version found was 10.30.0.231760.0, but the expected version was 10.30.1.236206.0. Thus, the warning was expected.
The recommendations to resolve the issue can be found in KBA 2234414.