Follow these instructions when Dropbox folders you have permissions to are not showing in your Dropbox:
 
1.       Click on the Dropbox folder link from the chat or email. 
 
2.       Once in Dropbox, click “Save to Dropbox” on the top right of the window. 
 
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3.       Click "Save" in the pop up window.   Now this new folder is in your list of Dropbox folders.
 
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4.       After clicking "Save," that folder is visible in your list of Dropbox folders.
 
It takes longer to be visible in Finder (takes longer to synch).  
 
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