Problems when writing a Blog post if the user is "Developer"

Gigaherz is having odd issues.
Basically he has a Drupal User with the "Developer" permissions.
The problem appears when he hit "Save" button when writting a "Blog post" draft. He is redirected to an error white page. Probably Drupal is stopping him there because missing permissions?
Seems this time the post was not placed neither into "Needs review" category, please Z confirm, so it got lost.