Can you open the Console application (in the /Applications/Utilities/ folder) and see if anything is reported up to and during the application hangs?
Are you actually getting a crash or just a hang? (A crash will display an "unexpectedly quit" dialog on its own (creating a .crash file) , whereas a hang will require you to explicitly force the application that's not responding to quit, which will then generate a .hang (" stopped working because of a problem).
If you are actually getting a crash, please post the crash log (as much as you can) or otherwise provide access to it (as they can be somewhat long). If it's a hang, perhaps any output to Console might be more informative than the .hang report.
You mention iTunes does not start at all: do you mean it immediately starts to hang when you try to launch it, or does it crash with an unexpectedly quit dialog?
Also, try launching Activity Monitor (also in /Applications/Utilities/) and be sure to set the "Show" popup menu to All Processes. Check once at launch or on a fresh startup to see if there are any processes highlighted in red. Then when you begin having the problems, check again in Activity Monitor to see if there are any processes shown as not responding; if so, please post the name of them along with any info that's reported to Console.
My rough guess of what's happening is that either coreaudiod itself, or another sound/multi-media-related framework or launch-on-demand agent or service that these apps need is not responding, which in turn causes any applications that rely on it to hang as well.
I see nothing in your Report that gives me a clue to the cause.
Whenever I have unusual behavior like this, I reboot in Safe mode, then restart normally.
Safe mode startup is a very useful fix-almost-all-OS-problems tool. It does a Repair disk during the boot process, and is faster than booting from an external drive to run DU-Repair Disk on the internal drive.
Disk Utility is an app native to the OS. When it or any other native app misbehaves, you should concentrate your repair efforts on the OS. When booting in Safe mode, all 3rd party additions are "disconnected", and only the base functions of the OS are activated.
My second effort at fixing this problem would be to re-install the latest Combo update. This will do a similar thing - revert any intentional or inadvertent changes to the OS back to the default state, without affecting your data and most settings.
Third, if you have a relatively current external backup clone, you might try booting in that drive to see if the DU problem persists. If the problem is not there, you can clone that drive to the internal drive and restore current data from Time Machine.
Those folks that are Terminal-savvy may offer better solutions.
Hope this helps.
Best Answer
This is a wonderful issue to follow the two articles Apple publishes on isolating issues (not that it's wonderful to crash, but this is a very small contained issue that should be easy to isolate and then fix):
That sets the table for you to dive into software isolation (which this is clearly the first thing to try)
In your case, making a new user account, verifying if the crash is system wide or just your account is the next step I’d take. Once that’s done, you can think about updates / verifying a backup, etc...