I'm running a multisite network on WP 3.1 with Genesis 1.5 and various Child Themes. I tried to upload a favicon using this plugin & got the error message:
Currently at this time only file type supported are .ico
As the file is already a valid favicon.ico I'm not sure what is causing this error.
I also added ico to the list of Upload file types in Network Admin settings, but the error still appears.