They're actually the usual hedges you'll see. Hell, even some mice will say to not plug them into a USB hub.

> Data transfer is not guaranteed in the following environments, even if your computer is equipped with a USB port.

>> Computers with a USB port added by means of an extension card, etc., computers without a factory-installed OS, or home-built computers

Manual for version 1.7 page 286

https://download.omsystem.com/pages/inst/om1/manual_om1_v1.7...