Encontre la solucion por medio de este usuario: nohossattraore.
Hi,
Eventually I found out why I couldn't access the Pages tab.
In the authorization_role table, the following lines were missing:
ID - slug:
53 - ROLE_MOD_TAB_ADMINCMSCONTENT_CREATE
54 - ROLE_MOD_TAB_ADMINCMSCONTENT_READ
55 - ROLE_MOD_TAB_ADMINCMSCONTENT_UPDATE
56 - ROLE_MOD_TAB_ADMINCMSCONTENT_DELETE
If you put them back on the table, you can access the Pages tab and grant the access to other profiles.
But the only thing I don't understand is how these lines were removed.
For now, I'm closing this issue.