Can’t even uninstall iThemes. Permission denied.
Nor new plugins can be installed.
I think one should stay away from iTheme security.At least until it is resolved.
I have a similar problem. the message I receive is:
Unable to write to your .htaccess or nginx.conf file. If the problem persists contact support.
The file path entered does not appear to be valid. Please ensure it exists and that WordPress can write to it.
where is nginx.conf file? I can not locate it?
BTW I also have another access or ownership problem with wp-content directory which I have posted here:
http://wordpress.org/support/topic/unable-to-upload-pictures-6