When using Gnus I get a flood of 'Invalid face references' in the
message buffer. i.e.:

Invalid face reference: gnus-summary-high-ancient-face [4 times]
Invalid face reference: gnus-group-mail-2-face
Invalid face reference: gnus-summary-high-ancient-face [11 times]
Invalid face reference: gnus-group-mail-2-face [2 times]

Harry