Applications windows minimise to taskbar when I move mouse towards them

This is driving me just a little crazy ...

When I have more than one window open, I click the mouse on the taskbar
button to bring up the window for that application. I then see it on top
of the previous window. It is usually half-size, not maximised.

The problem is that when I move my mouse towards that new window, it
minimises. Sometimes I try 3 or 4 times to move the mouse so as to keep
the new window on the screen, but it won't work. What I usually have to
do is press the Microsoft + M keys to minimise all windows, then click
on the taskbar again to get just the one window I want.

I don't usually have more than 3 or 4 windows open at any one time, and
on the screen I usually have just two. So how come my system won't let
me move a mouse towards a window without minimising it to the taskbar?

I don't remember always having this problem, but I can't figure out if
I did something to make this happen.

Any help appreciated, thanks!


--
anh