Removing error

Hi Sim4Lifers!

When I get a warning that the "Simulation materials were updated from Gabriel model in database to different frequencies: 1.2774e+08, 1e+09," I can't get rid of the it again. After I right click on material and 'update all materials' the warning is stil there. I assume it is just a bug that the warning doesn't disappear? Does anyone know how to get rid of the warning?