I'm glad it's fixed, though slightly concerned that state which witter retained was enough to cause reproducible segfaults.
The only thing I can think of is that somehow an avatar file got corrupted in just a certain way which caused the image libraries to segfault when trying to reload. I have no idea how to protect against that.

perhaps I should just write a wrapper script which magically relaunches if witter dies unexpectedly....kind of hides the problem rather than fixes it, but I believe segfaults are just out of my control.