I have Solaris 10 (u3, 11/06) X86 running under Parallels build 3170 (on macbook core duo). The USB EHCI controller fails to initialize at boot, and is unusable. Hotplugging hangs the system. The USB1 (UHCI) works fine under stable build 1970. (tested for adding USB flash drives) Has anyone found a workaround? For problem cases, It would be useful to have to the option to add legacy USB1 uhci support (e.g. taken from build 1970) instead of USB2 support when configuring the VM.