This is a difficult issue to resolve elegantly, as far as I can see since we can't know in advance what fonts are on any user's machine, and we're not bundling our own open source fonts with Slicer yet. For now, there are a few new ways to coarsely change your font family and font size. You can access these under the Application Settings Interface under font settings; or from the View-> menu. It's not guaranteed that all the font family options are available on your machine, but at least there're a few to choose from. For best results, you may have to select a new font family and size, then restart slicer so that all widgets pick up the settings. For some reason, not all widgets reconfigure themselves live. I'm marking this resolved for now, but not closed. We may think of better ways to accomplish this...

I'm taking over this one

http://www.slicer.org/slicerWiki/index.php/User:Barre/TODO

Starting the font cleanup, will keep only the default font size, and a smaller one computed from the system default (instead of hardcoding everything), and possibility of increasing from there.

Closing. Slicer3 is not being developed anymore.