Handle leak - Crystal for VS 2010

Question

I've been playing with the Crystal VS2010 runtime and have come across a problem which I believe might be a handle-leak in Crystal Reports.
I can reproduce this at will using the following example:
I created a project with a typed dataset (containing 2 empty tables with only a single column each).  I then added a blank report to the project and only added a single text object to it - no data is loaded from the dataset at all.
Then, I can execute the following 100 times in a loop:
using (DataSet1 dataSet = new DataSet1())
   using (CrystalReport1 report = new CrystalReport1())
      report.SetDataSource(dataSet);
      report.Close();
   dataSet.Clear();
This I then follow with a forced garbage collect, just to make sure everything was cleaned up properly.  However, +- 100 new handles were opened and using sysinternals' handle.exe, these show up as Mutexes e.g.:
1324: Mutant        \Sessions\1\BaseNamedObjects\CrystalReportXalanInitilizeMutex2916l
I haven't been able to find any information about this on the forums or the internet - can anyone confirm if this is a known issue?  (Or am I doing something stupid? )
Thanks!

Answer 1

Hi,
I've tried some of your suggestions:
In you report check on No Printer and check off all o f the Verify Database options.  - Made no difference
Also, be sure to use the Legacy mode in your app.config file, search for it. MS issue with DataSets. - Also, no difference
GDI Objects  - These don't budge - this is a Mutex leak, not a GDI leak
As for datasets, I'm not filling the dataset - its empty.  So a database does not enter into the equation, and no database connection handles are therefore ever created.
Also, I tried the printer theory by running the app on a machine without any printers installed - the problem persisted.  Machines also have entirely different graphics card drivers, so highly unlikely to cause the problem.
I've also tried targeting both Framework 4.0 and Framework 2.0 - the leak occurs in both cases.
The code that I posted was only a snippet yes, but it really is 90% of the test-app.  This is the whole content of Form1.cs (a single-button form):
using System;
using System.Windows.Forms;
namespace CrystalLeakTest
    public partial class Form1 : Form
        public Form1()
            InitializeComponent();
        private void ProduceReport()
            using (DataSet1 dataSet = new DataSet1())
                using (CrystalReport1 report = new CrystalReport1())
                    report.SetDataSource(dataSet);
                    report.Close();
                dataSet.Clear();
        private void button2_Click(object sender, EventArgs e)
            for (int i = 0; i < 100; i++)
                ProduceReport();
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();
            MessageBox.Show("Done");
The rest of the app is simply a blank report, a blank typed dataset (with 1 table and 1 column - no data).  That really is it
Is there anything else I can try?
Thanks!