Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
We can reproduce the problem you posted and will have a fix in ImageMagick 6.3.0-6 Beta within a day or two. In the mean-time add -font helvetica to your command line.