Available for download from the Pro Tools 7.3 and core system downloads sections, and the Pro Tools CS Updates quick link in the Support section:
http://www.digidesign.com/index.cfm?...4&itemid=23300
In addition to all previous 7.3.x fixes, the Pro Tools HD 7.3.1cs3 update for Pro Tools HD 7.3 & 7.3.1 adds the following:
Random Disappearance or Corruption of Regions On Tracks When Editing Or Punching In (Item #85976)
* Although this could occur while editing or recording over regions, the problem was most evident when QuickPunching over existing regions.
Importing Audio Files From A Sound Devices 744T Field Recorder Causes Multiple Problems (Item #90570, 90726)
* Audio files would not have a Unique ID assigned to them
* An assertion, "FF AudioProperty.cpp, line 33" would be thrown when overviews were being calulated
* Audio could be unreadable by Pro Tools
Attempting To Play From The Beginning Of A Session May Fail (Item #85674, 93283, 93289)
* After the play command, the Play and Stop buttons flash, but Pro Tools does not play.
* Repeated attempts may result in a successful play
Mojo SDI Could Not Directly Resolve To PAL Black (Item #90821)
* Note that Mojo SDI would switch to "internal sync" when changing the video format in Pro Tools
Error: "Digitize Aborted Due to Dropped Frames" When Digitizing to Mojo or Mojo SDI (Item #91345)
* Note: The fix covers most, but not all cases of this bug
DAE Error -6042 During Record Could Result When Using a Mac Pro (Item #92185)
* This could occur using HD1 or HD2 when recording a very high number of tracks