I'm happy to announce that RT 4.0.1 is now available.
This release is a bugfix release. It contains a number of notable fixes identified since the 4.0.0 release:
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Fixes for MySQL+Sphinx and native PostgreSQL full text search, and improved documentation.
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Javascript to forbid running RT in a frame, to prevent clickjacking attacks.
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Better detection and hinting of common web path misconfigurations.
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Minified javascript with an external jsmin now works in fastcgi and mod_perl deployments. This requires that mod_perl deployments switch to 'SetHandler modperl'; see docs/web_deployment.pod .
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Javascript fixes for IE8 in the admin UI.
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Multiple warning fixes during the upgrade process.
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Removed previously missed rights related to right delegation.