Some people have had a few issues, though as far as I’m aware there is no reason that Genesis cannot run with 3.0.x with a few tweaks in place and there’s plenty of anecdotal evidence of just that across the forum. If you need to stay on 2.0.11, though, then we’ll help if we can (though this help will be naturally more limited since there will for instance be no more bug fixes for the old code-base, etc).
To the issue at hand, it looks to me as if the add event button which you put in place unfortunately consists of badly formed HTML (the anchor element is opened but not closed):
<div class="add-event-button">
<a href="http://sandboxing.capemyers.com/events/community/add">Add Your Event</div>
I’m not sure why that has happened but it’s quite possible that this is confusing browsers and consequently changing the appearance of the list/grid view links/buttons.
Could you revise your custom button code and see if that helps?