Steps lead to bug,
1, Create git repo.
2, add and commit a header file named a.h with contents below
/*

• This file is part of my test package
  *
• Copyright (C) 2011 My Corporation. All rights reserved.
  */
  #ifndef MY_HEADER_H
  #define MY_HEADER_H

#endif // MY_HEADER_H
3, Start qtcreator and open a.h.
4, Set Color scheme (vim dark) in Options -> Text Editor -> Font & Colors -> Color Scheme.
5, Git blame source code, either using Alt + G, Alt + B or Tools -> Git -> Blame for a.h

Expected result:
Foreground text should be in color other than black, and syntax on.
Real result:
Both background and foreground are black in editor.

BTW, other commenting style header file may not re-produce this bug.