I am trying to start a GAE run configuration in IDEA 10.5 - after compilation and the web artifact being built, the process simply fails to start, with no errors. I uninstalled the plug-in and the process once again starts correctly.

I also attempted to create a plain Java Application run configuration to start the process instead and this also fails with the same issue. The GAE libraries are pulled in as module libraries, via a Maven POM. I'm not sure if this is linked, but there definitely seems to be a problem with Run configurations when the main Java class being run is located in an external library, rather than being part of the project code-base. I've checked the IDEA logs and no errors are thrown. The plain Java Application run configuration had the following settings:

Main Class: com.google.appengine.tools.development.DevAppServerMain
VM Parameters: -Dappengine.sdk.root=<sdk_root> -javaagent:<sdk_root>/lib/agent/appengine-agent.jar
Program Parameters: --disable_update_check <war_file_location>
Working Directory: <sdk_root>