I found a problem upgrading an existing application with a custom platform created in 6.5 to 6.7.

Steps to reproduce:
1. Create a Platform application with NB 6.5 named "testplatform" (using this name is important!).
2. Open the resulting project in 6.7 and invoke the create_platform task.
3. Copy the resulting platform from the dist dir of the app (otherwise you'll run into a bug described elesewhere)
4. In 6.7 create a new Platform app (e.g. "testuseplatform" ) and go to project properties-> libraries -> add platform
5. Register a platform using the testplatform dir
6. Use this as the platform for your project.
7. try to run the project it will fail with some weird error like this:

run:
/Applications/NetBeans/NetBeans 6.7.app/Contents/Resources/NetBeans/harness/suite.xml:468: The following error occurred
while executing this line:
/Applications/NetBeans/NetBeans 6.7.app/Contents/Resources/NetBeans/harness/run.xml:119:
/Users/antonepple/Desktop/testplatform/elster:/Users/antonepple/Desktop/testplatform not found.

If you create your "testplatform" project initially using 6.7 the problem doesn't occur.

The problem seems to be caused by the use of the string "platform" in the name of the application. It seems some ant
task evaluates the path by looking for the string "platform" with a regular expression and spoils the path, because
there's not only platform10. 

workaround:

In project.properties rename your application:
app.name=test

Then it works...

I didn't have time to dig too deep this time, but the path conversions around cluster.path.id and cluster.path.evaluated
and the ConvertClusterPath might be worth a look.