Can´t use SAN transfer mode after update to 5.1.0 u1

Good morning,

After the update from 5.1.0 to 5.1.0 U1 Build 36098 we are not able to run backups with the SAN mode.

Before update:

2013-06-14T16:00:54.016+02:00 [16168 trivia 'transport'] Transport mode san passed pre-flight checks. Adding to list of available transports.

2013-06-14 16:00:54: sbc-3925: Info: VDDK: INFO: diskLibPlugin: 2013-06-14T16:00:54.016+02:00 [16168 trivia 'transport'] Transport mode san passed pre-flight checks. Adding to list of available transports.

After update:

2013-06-29 10:30:22: sbc-3925: Info: VDDK: INFO: diskLibPlugin: 2013-06-29T10:30:22.007+02:00 [09884 trivia 'transport'] Running in VM: moref:vm-50

2013-06-29T10:30:22.007+02:00 [09884 trivia 'transport'] Transport mode san failed pre-flight check. Ignoring.

2013-06-29 10:30:22: sbc-3925: Info: VDDK: INFO: diskLibPlugin: 2013-06-29T10:30:22.007+02:00 [09884 trivia 'transport'] Transport mode san failed pre-flight check. Ignoring.

So the hotadd mode will be used and the vCenter gets a bluescreen

Any idea?

Thanks!