select distinct s1.string from elggmetastrings s1 join elggmetadata m on (s1.id = m.value_id) join elggmetastrings s2 on (s2.id = m.name_id and s2.string ="filestore::dir_root");

this is the ouput

'/Data/elgg_data/'

'/opt/ibm/apache2.0/htdocs/uploadselgg/'

'/data/elgg/'

'/test/docroot/webdocroot/elgg_data/'

Maybe a very different reason, but I had the same issue and the problem was in a additional carriage return coming from a plugin. You could try disabling all non-core plugins and see if you get the images again.

Make sure you follow the upgrade instructions exactly--especially the part about running upgrade.php and copying htaccess_dist to .htaccess.

MRA Welkers' suggestion is also a good idea.  If you edited any of the files with Notepad, you might also be encountering a BOM character problem.