If you change the name of the database in your config.php, that's it, it's using the new database and not the old one. None of the things you mentioned will have anything to do with it.
I'm sure Joe knows a lot more about styles than I do, but I'd say that if you switch databases and the problem is still there, then it was always there and you just didn't notice for some reason. I suppose if you have "Store CSS Stylesheets as Files" set to yes then it's possible there's some CSS that's not affected by switching databases. But I agree with Joe that there's really no way it could have been a problem with that mod.
The alignment of things can be affected by the length of post and thread titles - maybe it's just that someone posted a new thread with a title that's longer than when everything looked right.
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