In current and last organization I found some strange issue where the approval workflow set at library level works intermitently fine.
Here are my settings in Approval workflow:
enabled -Allow this workflow to be manually started by an authenticated user with Edit Item permissions.
enabled -Start this workflow when a new item is created.
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Now I found that the WF status no started as below:
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Please assist me, seems like it is one of a SharePoint 2010 bug