Heads up! I ran into this issue and the following works to fix it.
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What’s happening: I’m able to get to the webgui and login with my preset username/password. It then asks me to create a new user, which I do. When I get in and click “Add Folder” there are no folders (it’s empty). Also, if I restart the btsync process, it asks me again to create a new user, like it never actually saved the first user I created.

http://forum.bittorrent.com/topic/31586-synologynastentative-solution-to-resolve-cannot-accept-eula-cannot-see-folders-in-add-folder-view/

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