"Add Bookmark" Not Working

Thanks for the tips. Trashing the prefs file seemed to work - until I discovered what may be the root cause. I just noticed that I have three complete sets of my bookmarks in my "Add Bookmarks..." menu drop down list.

I recall when syncing my new iPhone that I was getting a system message that indicated that more than 25% of my bookmarks had changed. I use MobileMe for synchronization and somehow in this process I now have multiple redundant bookmark lists.

I think what was happening was I was selecting the bookmark folder to add a bookmark to and it was a folder not associated with Safari - it was probably associated with either my iPad or iPhone - consequently it wasn't being saved on the Mac.

What's the remedy? Do I have to manually redefine each bookmark and delete the redundant ones? The redundant bookmark copies do not appear to show up in the manage bookmarks screen - they only show up under the "Add Bookmark..."

I'm probably not being clear here, but looks like I have a mess on my hands. I recall getting a similar sync warning message associated with my Calendar events - but I don't see a redundant list of calendars there.

I have done a bit more digging and noticed I do have duplicate bookmarks within the "show all bookmarks" screen of Safari. Looks like the following:

COLLECTIONS

Bookmarks Bar
Bookmarks Menu

BOOKMARKS

BookmarksBar
BookmarksMenu

Contents of those folders (actual bookmarks) are identical between the top and bottom. Which should be deleted?