Redactor 2.2.0-rc1 introduced a bug that broke the media browser in some browsers. Redactor 2.2.0-rc2 is now available and fixes this issue along with a few others.
++ Redactor 2.2.0-rc2
++ Released on 2016-05-03
+++++++++++++++++++++++++
- Fix file path issue with dom4 and no-flexbox polyfills which broke the browser in certain browsers
- Fix issue causing file browser to not open to redactor.file_browse_path
- Fix uncaught type error in Eureka Media Browser when media source is not yet set