Featured image is blurry in "Seasons"

Hello,
I'm using the Seasons theme, but the featured image is blurry (when you click on it, you get the "normal" clear image).

Does anyone know of a way to fix this, other than not having a featured image?

Thanks in advance.

Recent errors in the log:
/usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(905): Zend_View_Abstract->render('items/show.php')
#16 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(926): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/show.php', NULL)
#17 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(965): Zend_Controller_Action_Helper_ViewRenderer->render()
#18 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#19 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#20 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#21 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#22 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#23 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Zend/Application.php(382): Zend_Application_Bootstrap_Bootstrap->run()
#24 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#25 /usr/home/boxeldermuseum/public_html/exhibits.boxeldermuseum.org/index.php(23): Omeka_Application->run()
#26 {main}

The logo image? What is the resolution of the image you are using?

It's the featured image on the front page. I've used many different sizes/resolutions of the image and it always comes out blurry.

http://exhibits.boxeldermuseum.org/

The problem is that the image is being stretched from 200 x 200px to 304 x 304 px (in my browser). Because it's a relative size, it gets smaller if you shrink your browser window.

You could either try re-deriving the square thumbnail at 300px using Derivative Images or use the full-size image instead of the square thumbnail, with overflow:hidden; in the CSS to prevent the div from getting too large. You could also set the image to max-width:200px; in the CSS.

That did it! Thank you!