After migration from one server to other, some images disappeared, randomly.

Images are still on server (confirmed by ftp).
Permissions seem fine (755 folders, 644 files).
Only some images appear at media library.
Some images appear, but are not time related. For me the header doesn't appear, for a friend in another city yes. And also appears using a proxy. But also half images are not showing.

Examples:

http://reinehr.org
http://reinehr.org/blogs-e-internet/receitas-caseiras-de-desodorantes-xampus-sabonetes-pasta-de-dente-e-outros-produtos-de-higiene-pessoal/
http://reinehr.org/gastronomia/caldeirao-de-sabores/como-fazer-churrasco-iii-conheca-os-melhores-cortes-de-carne/#comment-11583

Tried everything i found on forums under my capacities with no success.

Any hint?