To see problem:

1. Insert a section in a document. (dialog box closes)
2. Insert another section
3. In the new section box, try to enter a name with lowercase s.

Actual:  Section1 (existing name) overrides the lowercase s.
Expected:  can type lowercase s as first letter, without Section1 overriding.

4.  In the new section box enter any lowercase text for name (e.g., abcd) and insert (dialog box closes)
5. Insert another section, try to insert New Section with uppercase (e.g, Abcd)

Actual:  lowercase a overrides the uppercase A
Expected:  can type uppercase A (etc.) for new section.

(nice idea to have autocomplete help -- but current implementation seems a little too aggressive)

(also found with 7.0.0.0.alpha)