session could not be started error domain=dtiphonesimulatorerrordomain code=2 有大用

Suddenly this morning I can't launch the iPhone simulator. I have the most recent Titanium continuous build, and haven't changed anything else to cause the problem. Cleaning my project does not help. Here is my Studio console log:

[INFO] One moment, building ...
[DEBUG] Detecting modules in /Users/micahalcorn/Dropbox/Titaniums/MyApp/modules
[DEBUG] Detecting modules in /Library/Application Support/Titanium/modules
[INFO] Titanium SDK version: 1.7.3.v20110826161351
[INFO] iPhone Device family: iphone
[INFO] iPhone SDK version: 4.2
[INFO] iPhone simulated device: iphone
[DEBUG] executing command: /usr/bin/killall iPhone Simulator
[DEBUG] No matching processes belonging to you were found
[DEBUG] finding old log files
[DEBUG] executing command: mdfind -onlyin /Users/micahalcorn/Library/Application Support/iPhone Simulator/4.2 -name 83c74cc6-ca73-452d-b0a8-fbe2eceb0d2b.log
[INFO] Launching application in Simulator
[DEBUG] App Spec: <DTiPhoneSimulatorApplicationSpecifier 0x100303b50> specified by path /Users/micahalcorn/Dropbox/Titaniums/MyApp/build/iphone/build/Debug-iphonesimulator/MyApp.app
[DEBUG] SDK Root: <DTiPhoneSimulatorSystemRoot 0x100301c20> path=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk version=4.2 name=Simulator - iOS 4.2
[DEBUG] using device family iphone
[DEBUG] Session could not be started: Error Domain=DTiPhoneSimulatorErrorDomain Code=2 UserInfo=0x100109d20 "Simulator session timed out."

'reset content and settings' worked for me, no need to restart

This seems to be a problem with the terminal. I had the same error message when I used iTerm or was running a tmux session. You have to run this from a vinilla Terminal.app instance. I don't know why. Seems to be a bug in ios-sim as well.