Numbers 2.1 (iWork Update 6) crashing when closing document window

So I've noticed an odd and nasty bug in Numbers 2.1 that causes the application to quit unexpectedly and have been able to reproduce this on Mac OS X 10.6.7 thru 10.7.2. Issue does not occur on the previous version provided through iWork 9.0.5.

Steps to reproduce:

1. Open Numbers.
2. Create a new document.
3. Modify the document (enter some text in a cell, delete the default table, etc.)
4. Click on the Close button, press Cmd-W, or choose Close from the File menu.
5. Choose "Don't Save" when asked.
6. Numbers will either quit on its own, or crash when attempting to click the menu bar.

Does anyone else see this issue?

 

Bump - has anyone seen this behaviour?