Yes.

That's what happens when a widget crashes. All non-Nokia widgets are removed and it's a pain. I recommend installing desktop activity manager.

It has the ability to save and load desktop layouts and switch them at runtime. This not only allows car and home layouts, but also has a one-button reload configuration that restores everything.

If I were you, I'd look away from alarmed and into some of those widgets you added or a general instability that could cause hildon to croak.