We use omeka.net. Before this upgrade, we were able to see lager image on the top of exhibit's item page after clicking the thumbnails in exhibits.The way of achieving this effect is to use "public theme" as the exhibit theme. However, after this upgrade, no matter which theme we use, I don't see bigger images. If to use the theme "season", we can get images on the top right.
The documentation for using Omeka.net is available through the Omeka.net Help pages (http://info.omeka.net)
Any additional questions should be send via the Omeka.net Contact Form: http://info.omeka.net/contact.
I had the impression that this forum was dedicated to the server version, but the "Get Help" button in the new upgraded omeka.net linked me to here. Anyway, I will use Omeka.net Contact Form.
Where was the "Get Help" button linked from that brought you here? Your site's admin dashboard or the omeka.net site?