I woke up this morning and find out that the application I was working on a few hours ago
stopped working...

To make a long story short, I'm having the exact same problem described in the following thread: http://extjs.com/forum/showthread.php?t=28875

I'm using:
  • GXT 1.2.3
  • Hosting mode / Chrome / Firefox / IE
  • Windows XP

Thank you!