Hmm.. maybe he is right, i will check this in a few hours when i get back to my pc.. the only reason i say that maybe he is correct (ie setting a msaster password ENCRYPTS the saved entries stored on your pc) is because i found this post from 2014, from Nomis (mikrotik creator) - (now im not sure if this was every put in to effect)
Thu Feb 13, 2014 8:33 am
Yes, this is true. Do not “save” passwords on a PC where you are not the only user. We are working on a new Winbox where you will be able to set a master password, that will encrypt your passwords.
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from:
http://forum.mikrotik.com/t/winbox-security-password-stored-in-clear-text-format/74216/1