I'm in the same boat - I've lost two nice themes I was working on
What browser / OS are you using?
I had this happen twice on Chome 6.4 under OSX 10.5.8
I'm using Firefox on Mac OSX 10.5.8.
Crashes Chrome too, eh? Bummer. I was hoping another browser might fare better.
I am having this same issue. Has anyone been able to resolve it yet? I love the idea of this program, but if I can't save favorites and then work on them, it is frustrating. Help, please!