view windows not coming to the front

I am a long time MS user. I am currently using on a Win 7 64 bit machine. 

Typically I have a 3 or 4 views open at a time. I stack them such that I can always see a little bit of each view. This allows me to quickly jump between views, and also have the views pretty large relative to the screen. All I need to do is click on the top edge of the view and it jumps to the front. This has worked for over 15 years in all the different iterations of MS. 

For some reason this stopped working recently. Now when I click the top edge of a view - it does not come to the front. I need to close and open view ports. At first I thought it was my computer - but it is happening on different computers (laptop and desktop) with different hardware and different video cards. I have tried rebooting machine - nothing seems to fix this. 

I am wondering if this is could be related to some Windows update I installed, or is it a MS setting somewhere that I accidentally changed? Not sure how I could have accidentally changed it on two different machines -but anything is possible with a computer. 

Any insight into this issue would be greatly appreciated. Thanks. 

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