Any news on this please? I have checked with the host and all ownership related permissions are ok. All other read/write permissions are ok as far as I can see via Filezilla. The error log is accessible via ftp. I checked the ftp account I created for you and it works fine.
I’m glad you got it sorted, I can only assume it might be another .htaccess file within the wp-includes folder which was stopping it loading assets, or maybe a deeper folder permission issue.