sendserial to virtual serial port

[CET]

I'm using a Microchip PIC 18f4550 microcontroller to create a virtual serial port.  Basically, you plug the microcontroller into a USB port of a computer and the computer thinks it is looking at a com port.  I'm trying to send a string to the microcontroller using the sendstring("my string here") function in the VB editor, but the microcontroller is only only able to capture the first character of the string.  The serial output in Mach is set up as instructed by Microchip.  I am able to capture the entire string using Microsoft's Hyperterminal, so I know the microcontroller works.  I'm using Mach3 version 2.56.

Any suggestions?  Thanks.

CET