I have been using phantomjs to create headless screenshots. This is how I usually do it:
phantomjs phantom-crowbar.js my-path/index.html mysvg bubble.svg
phantomjs rasterize.js bubble.svg bubble.png
When this is run locally, it works perfectly and creates the required png. However, when it is run on a remote host, the svg is created properly, but when I run the rasterize.js step, the png is not created in its entirety. The text from the svg does not show up in the png. I have tried increasing the timeout period in rasterize.js but that won't work.