Syntax error in git commit command

When attempting to commit files using QtCreator git tools, the git commit command is malformed. The Version Control window in QtCreator shows:

13:13 Executing: C:/Program Files/git/bin/git.exe commit -F C:\DOCUME~1\Mark\LOCALS~1\Temp\qt_temp.RO1908 --author "mark" <mark>
Unable to commit 136 file(s): The syntax of the command is incorrect.

The problem appears to be with the way the author information is handled. If I remove the author information, I can commit successfully using the same command from the command line (Windows shell).