[Pixie]

I seem to have cured the issue for now (although in a less than ideal way) by dragging the bookmarks.html file from the [local]>Library>Applications Support>OmniWeb 5 folder to the desktop. Adding bookmarks is now possible but importing the bookmarks from the bookmarks.html file causes an immediate crash. The same, synced, bookmarks file is running fine on another MacBook Pro I have that is running OmniWeb 5.11 on Snow Leopard.

Curious.

I think apple4ever might have it right in implicating CrashCatcher, as it could very well be that CrashCatcher is taking the browser down, rather than the browser crash invoking CrashCatcher.