VU meter missing USB record

Hi,

Yesterday I was asked to record a XY mic near FOH to USB stick. So I put the mics on input 41-42 and patched the direct out to the USB Rec. So far so good, but then the VU metering is gone in the USB Playback / Record screen. So I lost the last stage of check that I did it all right and the recording will be as I configured it.

Is this a bug ? When switching back to LR or a Matrix the VU metering is back.

Regards,
Pascal