I'm running Parallels 2.1.1598, with windows XPsp2 as the guest, Gentoo Linux (2.6.15-gentoo-r7 kernel) as the host OS, and have an actual HP PSC 2410 serial printer/scanner connected to a real USB port. Parallels Tools is also installed within the XP guest. Printer works fine (hpiod driver, cups printing daemon) under Linux. When I reassert the USB device (plug/unplug the printer's usb cable) with the virtual XP machine running, a Parallels Workstation message box pops up, saying "Unable to connect USB device to virtual machine!". Is there a conflict with the host side? I've tried stopping the linux printer drivers (hpiod, cups, and samba) but this doesn't seem to help. Anyone have any ideas? The USB devices are present under the list of virtual devices. TIA!