Hi Jean,
I'm still learning to use Directory Opus, and the issue I'm seeing might be due to a DOpus setting... IDK.
The issue:
If I use DOpus, then close it (via X button, which really minimizes it to the systray), then I open a folder with QAP, the folder I open will open as expected, but the previously-used folder will be behind it, in a separate window.
For example I was browsing Program Files, then closed it, then used QAP to open "My folder." My folder opened with a second window right behind it, that had Program Files.
Thoughts on what causes this?