Looks like a losing focus issue.

Repro:
1. Download attached project or use any project
2. Set up Collaborate for the project:
a. Go to Service window (Ctrl + 0)
b. Choose organization and create a new project.
c. In Service window, click Collaborate
d. Turn on Collab
3. In Service window, go to Settings tab
4. Click on the Rename button
5. Try to put in another name to the input field.

Expected:
The input field works as expected.

Note: it may be a UI element focus issue. Every time I click on the input field, the border turns blue very briefly then it goes away, indicating the input field only has focus for a split second.