iZotope has updated RX to version 2.1, which includes several important updates that address plugin improvements, AAX support, 64-bit Windows version and stability improvements.

New Features
Spectral Repair plugin usability improvements, including:

• Added a playhead inside the plugin for timing reference.
• Added 'Play Selection' option when running RX 2 as a plug-in.
• Increased the size of the captured buffer, which differs based on sampling rate.

Compatibility Changes:

• Added AAX support, available as an option during installation.
• 64-bit application support for Windows.
• Improved support for 3rd party plug-ins hosted in the RX Advanced Standalone application.

Other Changes:

• Fixed issues with Pro Tools handles.
• Improved readability of exported XML History.
• Other bug fixes and stability improvements.

Notes:

• 3rd-party 32-bit plug-ins require use of the 32-bit version of the RX 2 standalone application, not the 64-bit version.
• AAX plug-ins need to be enabled during installation and are not installed by default. Pro Tools 10.2 or later is recommended.
• Handles are not supported for AAX AudioSuite versions of Spectral Repair and Denoiser at this time.