I can reproduce this in an upgraded install (2.4.8-2 to 3.1.1-4), with the message:
The current role does not have access to this operation. [https://localhost/ojs/index.php/index/$$$call$$$/tab/settings/admin-settings-tab/show-file-upload-form?fileSettingName=pageHeaderTitleImage&fileType=image&_=1546434653531]
I should be able to look into this a bit later.