I’ve been updating a few of them with the latest updates and whenever i get to upgrading the licenses I get the message at the bottom of the window saying “no such account or incorrect password” (i go to the systems tab-licenses-upgrade/get license key) most of the boards i have just reset them. I’m pretty stumped and not too sure what else to do, I’ve looked for solutions around the forum and cant find much. Really appreciate any help you can give me!! 
From what version did you upgraded your board ?
You should update your board license, if you upgraded the rOS from RouterOS 3.25, 4.0beta3 or older version.
http://wiki.mikrotik.com/wiki/Manual:License#Upgrading_from_RouterOS_v3_.282009.29
To do this, just click on “Update license key” button in Winbox.