Why does indenting a task in Master project make a call to the LookupTable service for every task?

Hi All,

We've found that if you open a Master Project in Project Professional and then indent any task - whether in the master or the subproject, that a call to LookupTable.asmx is made for every task in the project plan.  This is causing a large performance issue.  

Is this a bug in the application?  Is there an existing hotfix?

Please see the attached screenshot from Fiddler.

Thank you!