Yes it does - "say" gets another task bar icon - but Slick in position 4 still exists and is underlined and attached to the main slick window.
In the problem I describe the Slick in position four loses the underline - so Windows doesn't think that the Slick main window belongs to the pinned task bar icon.
This does not happen when I run "vs +new" - both instances of Slick are merged into the one icon as expected.
If I run a different version of slick with vs+new, then the new instance does get a separate icon - also expected.
In fact, to fake-repro the problem do this:
1. Pin "C:\Program Files\SlickEdit Pro 23.0.0 Beta3\win\vs.exe" to the task bar.
2. Close all instances of Slick.
3. From the command line, run "C:\Program Files\SlickEdit Pro 22.0.2\win\vs.exe"
Now the taskbar should have two Slickedit icons, the one you pinned and the one currently running.
4. Click the Pinned Slickedit -- the old instance of slick is brought to front -- because that is what "vs.exe" does when explorer runs it.
Remember: This is a fake-repro to demonstrate how the taskbar appears when the real problem happens.