I read the support ticket on here, #15322, and first of all removed some code I had added today to block some URLs. This didn't help, so I disabled .htaccess completely. Still getting the same error code now of 334 no matter what I do.
Siteground suggested I optimise database tables, which I did and no difference. I actually deleted Admin tools and tried to install new version. Having the same problem with Akeeba Backup.
Any ideas?
Cheers,