Also it would be good that you paste all the information that comes from the console (terminal) when it crashes. In any of both cases try to run synfigstudio by the command line instead of the menu, to let the console or the terminal alive after the crash.
Also it is important for us to try to reproduce the bug if it is related to a particular file and the version of Synfig that you’re using.
We strongly recomend to install the latest released version and if it still crashing install the latest snapshot. See the download page.
If in windows, please don’t loose this thread:
-G