Is there a problem defining a View using a path alias? Or did I just miss something? CONDENSED SUMMARY OF ISSUE:
I have a view with a path of /taxonomy/term/%/something that responds to a URL alias of /spec/ID/ so entering /Spec/ID or /Spec/ID/Something displays what is in the View.  If I clone the View and change the paths from /taxonomy/term/%/something to /Spec/%/Something entering a URL of /specs/ID will no longer display the view. 

ADDITIONAL INFO:
I have created a View (D7 Views3) with several pages each with the path /taxonomy/term/%/sub-category where subcategory is a label for a subgroup of content for the specified term. A filter in each page limits the content to match the subcategory label.

I have created an alias for a vocabulary /specs/[term:field_specno]. The field, attached to the term, provides a unique ID for the terms relating to a client's set of standards.

If I enter a URL for /specs/term1, the view will display the correct content for term1 on a page display, with operating Menu Tabs I have defined for each page in the view. It works great except that if I select another Menu Tab, the URL changes to taxonomy/term/%/subcategory format used in the view.  This would be confusing if a user uses the URL and gets the cryptic tid instead of his ID system.  It I clone the view and change the paths to spec/[term:field_specno]/sub-categories, the view no longer displays the pages and tabs correctly.

Is there a fundamental problem in Drupal doing this or have I screwed up somehow?  Has anyone done something similar successfully?
It could be, that I'm still having difficulties understanding your question, but I have no idea why you would expect that to work?

/path/to/%term contains an argument, and as such there is essentially an infinite number of variations that could "fit" into that path.
A path alias "/pageone" to "/path/to/aterm", does not match "/path/to/otherterm", nor any other path in the system.

Each path alias must point to a specific path, and there is to my knowledge no way to automatically "Create all possible path-aliases to for a path /path/with/%arg". There is a feature request for such a tool though.