alt + tab not working properly

ALT+Tab functionality has suddenly started misbehaving. it's showing only desktop and the current active app instead of all the applications opened.

For eg currently, opened applications are firefox and terminal but when i press ALT+Tab I can see either "desktop + firefox" or "desktop + terminal" depending upon whether the current active application is browser or terminal.

I have not installed any update.

Please help.

Are the apps on different desktops? The Alt+Tab switcher cycles through the apps on the currently active workspace only.

I had this problem with the 12.10 beta 2, although I don't know precisely why it behaved that way, here is how to fix it.

Go to your System Settings > Window Behavior > Task Switcher

Now, on the right side, under the heading "Filter Windows By", the Minimization setting should either be set to "Visible windows" or deselected entirely. That fixed it for me.

If it is set to "Hidden Windows" it tries to show the desktop, it minimizes all other windows, and just seems to behave weirdly.