Hi. Maybe this is explained somewhere (I did not found), anyway: if you don't see jpeg images in your web after upgrading, go to
ndxzstudio/defaults.php
Line 43:
$default['images'] = array('jpg', 'gif', 'png');
And add 'jpeg' there.
If you still don't see your images, unpublish and publish again the exhibit. It works for me.
:)