Created attachment 686921 [details] error-1354247977668.txt User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Firefox/17.0 Build ID: 20121119183901 Steps to reproduce: Sync attempts fail after attempting to add a bookmark. Symptoms persist across multiple devices. Actual results: Bookmark menu is devoid of bookmarks suddenly on all devices associated with Sync account. Message: Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action. Error log indicates that a bookmark item is most likely to blame. Expected results: Bookmarks should sync properly across all devices. Sync should either function or give a meaningful course of action or information.
Week elapsed. Error still remains.
Your bookmark database has become corrupted in some way, most likely by a 'root' being deleted. Please see Bug 817445 for more, including recovery approaches.