Yeah, you're probably on the new one. The last time I remember accessing the old version was when I accidentally clicked on it instead of the multipage option. I don't know of any other way to get to old version (maybe someone else does..). If you wanna see the old version, go where you usually find the "multipage" option, and the old version option is right underneath. When you wanna get back to the new version, I heard you just log off and log back in.
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Oh, I see! Thank you very much (⌒▽⌒)
What's the difference, and how do I access either? There doesn't seem to be anything at the top of the page saying 'switch to new version' or something for me though, so am I using the new one then?
(However, I have been using mangago for about a year now, and nothing seems to have changed.)