Can't Debug a script task

After upgrading to CTP16 (Sept.), I can't seem to debug my script task. Everytime I run the package with a breakpoint in script task I get following error: "SQL Server Integration Services Script Task has encountered a problem and needs to close. We are sorry for the inconvenience. "

If I remove the breakpoint the scrip task runs successfully. So my question is how do I debug a script task with CTP 16?

This should be posted to SQL Server Integration Services. Please acknowledge and I'll move the thread to the appropriate group.