A minor maintenance update to MathJax was released Thursday, June 9. The update corrects several issues in Internet Explorer and Opera, improves MathML support, and addresses a variety of other minor problems.
The release was deployed to the MathJax CDN, and is available for download or via source control at GitHub. Version 1.1a is backward comptible with v1.1 and for CDN users, no modification of content or configuration is required.
The change log gives a complete listing of the issues addressed in this release.