New Bluetooth Stack Connection Problem

Hello everyone,
I am in the process on including the last QFE into our next image version.
Unfortunately, I have problem with the new BT stack from QFE May-08. My
Microsoft Keyboard 7000 that was working correctly with the old stack
doesn't work anymore. The device can be scanned, I am activating it but
the keyboard stay in searching mode. Any ideas what could make this?

Thank you,