Can I ask what do you mean by "RESET" all the toolbars? Did you switch off all toolbar related add-ons and then re-enable them all at once. I tried disabling and re-enabling the Diigo one, but it made no difference?
I, am facing exactly the same issue. The bookmarks show up in the latest bookmarks but not on my dashnoard or when I do a search for those tags. It used to work absolutely fine earlier.
I was just wondering if it is possible to share all bookmarks wihin a certain tag?