This frame was added in the default UI in the 2.4.3 patch.
To stop the message just disable the skinning of the frame using/skinner ui timemanageruntil you have got the patch.
thanks you for your answer but anyway, i updated wednesday in france with 2.4.3 patch and i can check this on login screen at bottom left.
So, maybe something is wrong but because i only use skinner for bottom frame and nameplate, i try to look at this new frame in skinner option and disable the skin for this frame.
EDIT: this new frame were enable so i just disabled it and it's ok..maybe localized, yes.. and if i can help you for anything, just ask me, i come very often look at this forum. (french)