Few days before I faced problem in my wordpress blog theme editor.When I am trying to edit themes in wordpress blog it is going to disable state it happened with chrome and Mozilla browsers.I was searching in internet to fix this problem.And I lost some of my theme files when I have given update file option.
Solutions:
1. Try to edit theme files in Internet Explorer.Wordpress theme editor is working fine with IE.
2.Second option is use Editplus.Yes Editplus is a wonderful text editor and we can connect ftp directly so can update theme files.