Have you recently modified your profile notification settings, Mike?
You can "Shrink or expand the header" by clicking on the arrow in the upper right hand corner of the forum window, which you may have done inadvertently. If the arrow is pointing upward, then the header information is displayed. If the arrow is pointing downward, then the header information is "NOT" displayed.
Please let me know if the header is still not visible the next time you login.