FYI: I have since downloaded, compiled and installed lightspark-0.5.3 (from http://lightspark.github.com/) and run the same testcase, the result was an error about my OpenGL lacking support for Framebuffer Objects (but no segfault). I updated my (restricted) nVidia drivers and that got v0.5.3 + this testcase working (an X11 window opens where I can drag a marker around a grid and the X/Y coordinate read-outs change accordingly).
FYI: I have since downloaded, compiled and installed lightspark-0.5.3 (from http:// lightspark. github. com/) and run the same testcase, the result was an error about my OpenGL lacking support for Framebuffer Objects (but no segfault). I updated my (restricted) nVidia drivers and that got v0.5.3 + this testcase working (an X11 window opens where I can drag a marker around a grid and the X/Y coordinate read-outs change accordingly).