Freezing after selecting USB

[jlums]

I recently built a bootable flash drive that uses syslinux to call plop for USB 2.0 drivers. Plop works perfectly on this flahs drive. I duplicated the setup on a different flash drive and am running into a problem. On the new flash drive when I select USB, the computer will freeze once it find the flash drive. I verfieid this by removing the flash drive and selecting USB. When I do that it continues through the rest of the process, but doesnt boot to USB because I have removed the device. Has anyone seen this before?

1st flash drive: Sandisk 4GB

2nd flash drive: Sandisk Cruzer micro 4GB

[jlums]

Update: Different versions of plpbt.bin freeze at different spots

5.0.13 - Last message displayed = "Port 8: Device Connected"

5.0.11 - Last message displayed = "Port 1: No Mass Storage Device"