Command line PNG export ignores vertical curly braces color

Title pretty much explains the problem, but I'll provide a little context:

I've been heavily leveraging the command-line PNG export feature, setting up a batch script in combination with ImageMagick, PHP, and an Ajax lightbox library to spawn browse-and-zoom-able mockups galleries with a single click. Was very happy with the new workflow (and so were my colleagues) until I noticed an odd variation today.

On command line export only -- not during an "in app" PNG export -- vertical curly braces loose any applied text color. I always do the text of my curly brace annotations in deep purple, to help them jump out from the mockup itself. Horizontal curly brace text retains its color, but vertical ones always revert to black.

Not exactly crippling, but the inconsistency makes my output look careless.

Hope that's an easy one to swat.

As always, thanks much. (And just for the record, that command line feature has turned out to be an enormous benefit -- it wound up boosting my throughput significantly, and led to a semi-automated system for sharing works-in-progress.)