We finally released the QT version of GVEdit for Windows(as of 2011.3.15) which should address most of the gvedit related bugs that have been piling up for a while. The new GVedit is designed to be OS independent and will be included in *nix and Mac releases as well. Those who don't know about GVEdit may have a look at its help page at http://shell-simulator.googlecode.com/svn-history/r12/trunk/docs/graphvi... Some of the highlights of new GVEdit -UTF-8 support -File size limitations are gone -Doesn't depend on shell calls to create graphs. Uses Graphviz as a library -Temporary file creation issues are fixed -Attributes, layouts and renderers are loaded dynamically. There is no need to change GVedit code to support additions to them. -Previews are loaded from graphs' original output if they are in QT supported graphics format. Otherwise jpg output is created and showed. Please do not hesitate to test it as vigorously as you wish.