USB Passthrough Entirely Broken in 5.1

Dear all,

there is a thread that already covers the broken PCI-passthrough feature.

In my case, USB passthrough is completely gone! I can check each controller (00:1a.0 and 00:1d.0), but after the necessary reboot they are unchecked, thus not passed-through, again.

This kind of ruins my whole ESXi setup.

Any workarounds out there ...?

Cheers

EDIT: USB passthrough worked fine in ESXi 5.0 U1 ...