I have been using XMarks for very long time to synchronize my Bookmarks over all my PCs.
( Even since XMarks has been known as Foxmarks... )
But at some point, I got some really nasty problem:
The "Unsorted Bookmarks" Folder started to get "replicated":
Every sync or so, I got one more.
And more.
And more...
And I never found out why, until now:
I had serval sync profiles (Work, Home, Mobile, etc...) with restricted access to my Bookmarks.
Problem was: My Work PC didn't sync the Unsorted Bookmarks Folder - my other PCs did.
That means: Every time the Work PC did sync and saw the Unsorted Bookmarks Folder, it was "new" to him and without settings and it did download.
Next time, he did "Push" it as new Folder to the Web - not as correct Unsorted Folder, but only as a normal Favorite Folder called like that.
The Other PCs did grab that, create it a new, sync it... and so on -.-'.
Folder Storm or so.
After removing all the trash folders and enabling the Work PC Sync for the Unsorted Bookmarks, I hope it will work out...