windows completely disappear when "minimize" button clicked

[user1]

On Sat, 22 Jan 2011 22:22:21 +0000, Jacob Mansfield wrote:

> just click on the button for it on the left

I am not quite sure what you mean by that?

The minimize button stopped working after I had been fiddling with the 
System - Preferences - System Settings - Desktop Effects - in order to 
get rid of the wobbling effect of my windows - I had tried a lot in 
various ways (without any luck).