I cannot delete images or feeds, or update alt tags?
If you can save data into the CMS but are only having issues deleteing images or updating alt tags, then your server is more than likely blocking certain HTTP requests from occuring.
There are different types of HTTP requests. The CMS usese many of them to interact with all of its content. Most websites only use GET and POST requests. Therefore, sometimes hosting companies will block other types of requests such as DELETE and PUT.
There is a fix for this though! Simply place the snippet into your .htaccess file on your server.
<Limit GET POST OPTIONS PROPFIND PUT DELETE> Order allow,deny Allow from all </Limit>