B1 9.1 PL10 - 'Kein Datenträger' upon start

Hi

Since we have updated to 9.1 (PL10) some of the clients sometimes get messages like this upon starting SAP:

After hitting 'Abbrechen' multiple times SAP runs normally.

The drive number varies from client to client. The drive referenced seems always to be from a USB card reader and nothing inserted to it.

Any ideas how to get rid of this?

Thanks, Franz