Bookmarks bar keeps changing by itself
Since a week I notice that my bookmarksbar keeps changing - apparently by itself.
It removes the order of bookmarks, and even removes complete folders.
I use Time Machine so I have been able to restore to a trusted version.
It is annoying though, that it changes. Especially when I notice the change after I have added new bookmarks; my overwriting it by an ols version I lose my added stuff.
I have not been able to see it actually happen, so I cannot tell what triggers it. The reordering usually takes place within 15 min. Deleting folders; I don't know. Less frequently.
Does anyone recognise this?
Thank you very much in advance!
iMac, Mac OS X (10.6.8)