Do you have multiple languages activated? And if you do, do you have both the UI and the Form selected for those languages in the settings? And if you have multiple languages, have you entered content the information section in the settings using the language that you are viewing the journal page with?
And possibly a second issue, what does this sql return for you
SELECT * FROM plugin_settings WHERE plugin_name = 'informationblockplugin' AND setting_name = 'context'
I am thinking whether it is the same problem described here: OJS 3.0 - Choose language & Search at the index page - #26 by asmecher