Forced Safe Mode just went live. Go into your account settings to check for the changes.
How to get rid of it:
iOS:
Leave the Tumblr app for a sec and go to the main Settings app on your device.
Scroll down and tap “Tumblr.”
Look for “Safe Mode” and adjust the settings to match your comfort level.
Android:
Go to settings: Tap the little person in the tab bar, then the gear icon in the top right, then “General settings.”
Tap “Filtering,” then
Flip the Safe Mode switch OFF.
Web:
Go to settings: Click the little fella in the top bar, then click settings.
Scroll to “Filtering,” and click the Safe Mode switch OFF.