Report works in Studio; fails to run when deployed

Our SSRS developers claim their reports work fine when run on their desktops, but not when deployed to the SSRS server. They blame the SS2008 R2 database server for some reason.  They say the reports which fail tend to be the larger reports with
the most columns / rows returned by their queries.  I do not have any access to the SSRS server and I would like to spend my time doing something other than defending the database.
What should the SSRS developers do?  What can I do to help?
Thanks,
Michael

I would recommend looking at the ExecutionLog views.  There is a pretty good article on how to determine where the slowness is coming from by looking at these views...
http://msdn.microsoft.com/en-us/library/ms159110.aspx
If it is truly failing and producing an error, they all get logged to the SSRS logs on the server.  That should also be a source to look at.  You will have to work with whomever runs the SSRS instance to look at the log files on the server and
to access the views on the databases.

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    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
    ASSERT [email protected]:436
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