title: SQL Developer not showing tables
body: <p>So, I'm kinda new to SQL Developer, but I always heard a lot about it and how it was good. The thing is, my SQL Developer never showed my tables, nor had a "Tables" tab. Sorry if this is a dumb question, but, I've searched everywhere and, wherever I search they simply show that SQL Developer automatically generate the "Tables" tab when you connect. This never happened to me.</p>
  
  <p>One more question, all of a sudden, my SQL Developer toolbars changed and the old ones simply vanished. And, when I say "all of a sudden" I mean it. I closed it and, when I opened, it changed. Also, the buttons doesn't work, none of them.</p>
  
  <p><img src="https://i.stack.imgur.com/zU5xj.png" alt="Screenshot of SQL Developer"></p>