I am from National Insruments, we have a software product called Lookout, when we install the update 2017-06 Security Monthly Quality Rollup for Windows 7 for x64-based Systems (KB4022719), there is a problem
for window to pop up.
In our software, there is a control panel(panel 1), in panel 1,there is a button(button1) which is connected to another control panel(panel2).
If we click button1, panel can pop up. Before we install the update, the normal action is panel can pop up on the top layer, which can been seen in the following picture.
But after we install the ipdate, the phenomenon is strange, when clicking button2, panel 2 can pop up, but under panel1, we have to click on the button for another time, then panel 2 can show up in the front,
this phenomenon is not expected.
I wonder if there are some changes causing this reaction. For example, modifying register key of fixed value of windows parameters , anyone has any ideas or recommendations?