What is the version of the Photo plugin? If the problem persists after disabling all 3rd party plugins, please check that the folders on the server:
ow_pluginfiles
ow_static
ow_userfiles
ow_smarty/template_c
should have 777 permissions RECURSIVELY
If so, enable dev mode and refresh the website a couple of times and see if the issue persists.
If it still does, please PM me your Cpanel access details and admin access details from the website, I'll take a look at the issue.
But according to our requirements: http://www.oxwall.org/hosting the module should be OFF.
Thanks for letting us know the reason of the issue. I'm going to mark this thread as Solved then.