3.2 does not support USB thumb/flash drive

[atz06]

I just updated my US Xoom WiFi to 3.2. The SD card is working fine and it is shown under mnt\external1. However, I still cannot access my USB thumb/flash drive even I have a Motorola OTG adapter. Looks like 3.2 does not support USB thumb/flash drive. Any suggestions? Or I have to root it and install a custom kernel to make it work? Thanks.