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Install update 8.1.3.
Update 8.1.3 did not stop this from happening. However, I have now figured out what's triggering it:
Adobe Reader is re-sizing its window to fit the dimensions of the page, rather than returning to its previous dimensions and attempting to make the page fit within that window.
Symptoms and ways to replicate the problem:
1A. If AR is Maximized to fit the full screen, opening documents of different page sizes does not cause it to change the window size.
1B. If AR has been Maximized to fit the full screen and you Minimize it to drop it down to the Task Bar, when you double-click on a PDF file, AR brings itself back up, but it switches to the Restore Down mode instead of returning to the Maximized mode. It then changes its window dimensions to fit the page size.
2. If you have AR in the Restore Down mode so that it doesn't occupy the full screen, double-clicking on a PDF file triggers the window size change.
3A. If you have AR in the Restore Down mode at the size you want, you can get it to stop changing the window size by clicking on the Maximize button, then opening a PDF file (either by double-clicking on it or by using the Open command in AR), then clicking on the Restore Down button to bring it back to the window size you started with.
3B. You cannot prevent the window size from changing just by clicking on Maximize and then Restore Down. You must open at least one PDF file while AR is in Maximize mode before you click on Restore Down.
4. When the window size changes, the start position of the window (the upper-left corner) will also change. Initially, I was seeing the window drop down and move right so that the window extended beyond the bottom of the Desktop. In testing it tonight, I have also seen the title bar at the top of the window jump up, causing the title bar to move past the top of the Desktop. It had moved so far up that I could not reach the top corners to resize it. I had to change the size by moving the right edge of the window and this caused the title bar to drop down about 6 pixels, just enough to make the title bar visible again. (Not sure why it dropped down like that since I was making a side-to-side change, but it was good that it did.)
5A. The window size change occurred when opening PDF files with different page dimensions and orientation. Documents used to show this size change problem were: A3, A4, US Letter, 11x17 and some custom sizes like 7.17x10.13. Some were in portrait orientation and others were in landscape orientation.
5B. The size change seems to occur when AR has to switch to displaying paper European paper sizes. Going from displaying a PDF file with US page size to opening a new PDF file with European page size triggers the change. The opposite does not occur (going from displaying a European page size to opening a PDF file with a US page size does not trigger the window size change).
5C. If there is a change in the orientation of the page, such as going from US Letter Portrait to European A4 Landscape, the amount the size of the AR window changes seems to increase.
So, it appears that the solution to this problem has two parts:
1. Adjust AR so that it pays attention to whether it was in Maximize mode or Restore Down mode, so that if you Minimize it to the Task Bar, it will remember which mode to go back to.
2. Give the size of the AR window a higher priority than the dimensions of the page in the PDF file that is to be displayed. (Or just change it so that AR never resizes itself to fit the PDF page size.)
Either always run AR in full-screen Maximize mode, or else go through the steps shown in 3A and then never Minimize it to the Task Bar. If you do Minimize it, once you bring it back up, you will have to go through the process in 3A again.