I think I had this same problem trying to add a link in places to my ubuntu one folder - /home/stu/Ubuntu One, strangly enough it worked on my desktop PC without any quotes no problem but every time i tried it on my laptop it just wouldnt work, it just said cound not find folder /home/stu/Ubuntu and could not find /home/stu/One. putting quotes around whole location didnt work, finally solved it with /home/stu/"Ubuntu One".
OK, solved my own problem whilst writing this, desktop had updated to MintMenu 4.9.4, laptop hadn't yet, guess that means that the update solved the problem for me.
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