FolderBrowserDialog problem after opening a database connection

[Anja]

I have installed the new Visual Studio 2003 and implemented the
FolderBrowserDialog.

Everything works fine, if I open the FolderBrowserDialog before
opening a Database Connection.

If I open the FolderBrowserDialog after I opened the database
connection no folders will be displayed in the FolderBrowserDialog.
It's empty.
1. it works:
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//open a test-form with a button, which opens the folderBrowserDialog
Anja.test oTest = new Anja.test();
oTest.ShowDialog();

//open Database-connection
OleDbConnection odconnScotty = new OleDbConnection(sConnectionString);
odconnScotty.Open();
2. it doesn't work:
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//open Database-connection
OleDbConnection odconnScotty = new OleDbConnection(sConnectionString);
odconnScotty.Open();

//open a test-form with a button, which opens the folderBrowserDialog
Anja.test oTest = new Anja.test();
oTest.ShowDialog();
What has the database to do with the FolderBrowserDialog???