JRE Build:
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build 1.6.0-rc-b65

Steps to reproduce:
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1. Uninstall all jre/jdk
2. Install jre1.6.0 build 65
3. If the file "deployment.properties" exsit in user.home/Application Data\Sun\Java\Deployment , delete it .
Then launch Java Control Panel , Enable click OK to exit.
Now there will be a new generated deployment.properties.
4. Edit the new generated deployment.properties , add following lines and save file
deployment.javaws.traceFileName=C\:\\unit_test\\protest\\trace.log
deployment.javaws.logFileName=C\:\\unit_test\\protest\\trace.log
5 . Launch Java Control Panel , switch to "Java" tag, click "View" of "Java Application Runtime Settings"

No dialog popup ( there should popup JNLP Runtime Settings ).
Click "Cancel" on Java Control Panel , notice that the deployment.properties file be updated as :
deployment.javaws.traceFileName=C:\unit_test\\protest\\trace.log
deployment.javaws.logFileName=C:\unit_test\\protest\\trace.log

Launch Java Control Panel again , popup "Java Virtual Machine Launcher" error dialog