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Introduced by 61f3e3e29, as part of my periodic efforts to make the GTK front end work usefully on OS X: the 'Unable to open connection to [host]: [error]' message box is accidentally passed through two layers of printf format-string parsing, the second of which has no argument list. So if you pass in a host name like '%s' on the command line, bad things will happen when that error message is constructed. This happened because in that commit I changed a call to fatal_message_box() into a call to connection_fatal(), without noticing that the latter was printf-style variadic and the former wasn't. On the plus side, that means now I can remove the explicit dupprintf/free around the error message.