Hi!
The same problem. PHP version: 5.1.6.
Plugin was upgraded from 3.1.4 to 3.1.5.
Red message is now displaying: “The last build succeeded, but the file was deleted later or can’t be accessed anymore. Did you move your blog to another server or domain?”.
I haven’t moved anything nor changed file permissions!
Debug doesn’t show any errors or warnings.
Sitemap rebuilds normally.
Solution provided for PHP4 doesn’t work.
Regards,
Dmitry.
