Rick Brewster, BoltBait,
The Windows OS keyboard shortcut (Shift key + Window Exit Button) that saves a program or application size and position has historically worked on my machines for all windows. I learned this shortcut once upon a time from the Microsoft Support site and have used it successfully in the years since.
On or about the date of the 5.0.12 update, which coincides with a Microsoft Patch Tuesday, the paint.net application window stopped remembering the window size or position after it has closed. Now it opens in the top left quadrant of the display each time regardless of any action taken by the user. No other window belonging to any other application or program suffers this fate. This is on an fresh install in August on a new build, new case, new motherboard, new memory, new graphics card. Once programs were installed and backups restored the status quo resumed with no issue, until just recently.
Now, having narrowed the problem down to either Windows or paint.net, has something changed with paint.net that could possibly contribute to this behavior? If not, I'll focus my efforts on Windows.
I should have been more verbose in my initial post. Sorry.