I get this same crash too. Windows 7. Vegas 11 most current build. I run 32bit because it imports AAF, and the 64bit doesn't. Yesterday I had no crashes, but today, already, two. Makes no sense. Windows hasn't updated itself, so it's not that.

Tried the Vegas Pro 13 trial?

I purchased 13.0 when it came out. It it totally unusable for me, since it no longer supports my Kona card, and since WAVES plugins are totally unstable and won't play glitch free. I've stuck with 32 bit 11.0 since it's the most stable and usable. Honestly, I"m gravitating most of my sessions to ProTools 11.0, since it's very good. I'll miss two things tho: being able to edit video, render video and place pretty much any video format on my timeline and any number of videos.

"... I open a new window..."

I want to see if I understand exactly what you are doing. By "open a new window" you are starting a different application such as Windows Explorer and Vegas Pro 11 loses focus.

What is the state of these switches in Preferences?

Interesting Reading:
http://www.sonycreativesoftware.com/forums/showmessage.asp?forumid=4&messageid=836035

Thx for responding John:

You understand correctly. When Vegas is open, with a project loaded -- and keep in mind that I use Waves plugins in virtually every one of my projects for audio -- and I go to open a new Windows 7 Explorer window (whether a local drive to find a file, or a networked drive, it doesn't seem to make a difference with this issue), Vegas instantly crashes and gives me the error dialog box asking if I'd like to report the issue. Some days it happens first thing in the morning after booting the computer, some days it doesn't happen until later in the day after I've opened and closed half a dozen projects, and other days it doesn't do it at all.

My General Prefs match your screen shot: both of those boxes are currently checked. I've never changed them. Close Media Files when not the active application, and Close audio and MIDI ports when not the active application

The only midi device I'm using any more is a FaderPort, and Vegas has had a built-in driver for that for several years.

The only other thing my computer has running is Microsoft Security Essentials, but real-time protection is not turned on. We're behind multiple firewalls here at our studio and I've never (knock on wood) had any malware or viruses hit this computer.

I'd thought that perhaps WAVES plugins (I'm running Horizon bundle with iLock) was causing this, as WAVES still doesn't always play nice.

jmm

I haven't used WAVES so I can't comment. When Vegas Pro pops the error and offers to send the error report, are there any details offered no matter how cryptic?

I've finally got better info on these crashes. Here is the crash report: Next time I get one, I'll compare and see if it is the same info.

Problem Description
Application Name: Vegas Pro
Application Version: Version 11.0 (Build 700)
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files (x86)\Sony\Vegas Pro 11.0\vegas110.exe
Fault Address: 0x199E7300
Fault Offset: 0x199E7300

Fault Process Details
Process Path: C:\Program Files (x86)\Sony\Vegas Pro 11.0\vegas110.exe
Process Version: Version 11.0 (Build 700)
Process Description: Vegas Pro
Process Image Date: 2012-09-24 (Mon Sep 24) 21:08:00

I hope you never get another one.

I would suggest looking at your log files in Event Viewer ( i think it's named the same in Windows 7 - I'm on an XP station at the moment) Check out the application and System logs to see what was happening at the time of the crashes. It may give you some clues as to the cause.

Answer the last question about whether or not the info on the crash is identical each time? Yes. I just saved four crashes that occurred over the past week, and each was identical.

Problem Description
Application Name: Vegas Pro
Application Version: Version 11.0 (Build 700)
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files (x86)\Sony\Vegas Pro 11.0\vegas110.exe
Fault Address: 0x199E7300
Fault Offset: 0x199E7300

Fault Process Details
Process Path: C:\Program Files (x86)\Sony\Vegas Pro 11.0\vegas110.exe
Process Version: Version 11.0 (Build 700)
Process Description: Vegas Pro
Process Image Date: 2012-09-24 (Mon Sep 24) 21:08:00

UPDATE:

The crash info is NOT all the same after all. It's often different in one location: this memory location keeps changing. Each of these is a different crash on a different day. jmm

Fault Address: 0x1F9F7300
Fault Offset: 0x1F9F7300

Fault Address: 0x1F9C7300
Fault Offset: 0x1F9C7300

Fault Address: 0x1FE17300
Fault Offset: 0x1FE17300

Fault Address: 0x199E7300
Fault Offset: 0x199E730

Spent an hour looking at every listing in these, and didn't really find much that coincided with the time of the crashes.

Does the crash happen if you uncheck the preferences for:
1. Close media files when not the active application
2. Close audio and MIDI ports when not the active application.

If it stops crashing after unchecking those, it is possible that the crash happens when re-loading media, which would explain why the memory address is different in each report.

Hey Eric:

i'll give those two options a try and see what happens. Stand by.

thx.

jmm