I use Mavericks Mac OS X 10.9.2 and Safari 7.0.2 on my iMac for some days.
I had problems with bookmarks and favicons.
I delete yesterday my webpageicons.db.
(This was a suggestion in an other thread).
After that I open some webpages with bookmarks and the favicons are new stored.
I work a day with my iMac with some application and change to an other account and go back to my account.
Now all bookmarks are gone.
I don't know this is using of other account?
I use other account yesterday after deleting webpageicons.db and go back and favicons are present.
Very good programming from Apple ;-(