Re: The Sims 3 panel gone missing!

That is usually a sign of game corruption.

Here's some info about the issue

Problem

I can't play anymore for there is no User Interface in my game anymore.

Cause

• The User Interface can be turned of via F10 so that you can take pictures or make a video without the UI.
• Corrupt save An error occurs on load-up which makes it impossible to load the game properly.
• Any ScriptErrors on loadup that prevent the game from loading properly.

Solutions

• Press F10 or ESC
• Try if reloading the game helps
• Solution by garbuckle3000
• Minimize the game and make a copy of your savegame
• Maximize the game
• Use ALT+Q to save and return to the main menu
• Restart the game.
• Solution by Cyron43:
• Open the cheat console with ctl-shift-c
• Type resetsim *
• Hit Alt-F4 to be promted to save the game
• Restart the game, you should have your interface back
• If nothing helps, you will need to load a backup