Somehow 4 my wp sites got white screen when opened and it happened like in the same times. I don't know why, I didn't change anything.
But when I do fresh wp install on a new domain, it's working fine. These 4 are older domain names and had already running wordpress and they were all fine previously.
I tried to do upgrade to 3.1 but I got this error message
The database affikom3_wrdp9 is not working properly and the creation of a database backup file has failed. Please contact the sysadmin for further assistance. Include this message for reference.
The initial installation has not been modified.
I did manual FTP install with 3.1 WP version and when I tried to do mydomain/wp-admin/install.php I got white screen.
I don't know what to do. My hosting techie didn't help either.