Screenshot
Steps to reproduce:
1.Open a page with VE
2.Go to Options>Categories
3.Try to add a category to the page
Observed Result:
Cannot place the cursor in the Add a category text box and cannot add a category
See the screenshot attached
Test Environment: http://en.wikipedia.beta.wmflabs.org/
Browser: Chrome Version 26.0.1410.65
OS: MAC OS X 10. 8
Page: http://en.wikipedia.beta.wmflabs.org/wiki/Newpage3rdfeb?veaction=edit
Version: unspecified
Severity: critical
Attached: