I scanned my internal drive and all was OK (I already know it was clean). It automatically switched over to scanning an external drive that I have connected via an IDE to USB adapter. It said, "Detected so far: 14 results of threat level 5 detected. 7 results of threat level 1 detected", then it threw an application error: "Exception EInvalidCast in module SDScan.exe at 002A39B9. Invalid class typecast." with an OK prompt that when clicked, closes the program.
I rebooted and retried and same result in same order.
The non-beta Spybot scanned that drive just fine albiet very slowly.
I have a screen shot of the error but I am new here so I will see if I can post it for you.