FT-920 and MixW

Hi,

I just started with MixW 2 with my Yaesu FT-920. I have connected the FT-920
with the serial cable to my computer. When trying to transmit, I can only
transmit in LSB mode.
In MixW I changed the settings in "Configure" -> "TRCVR & CAT/PTT" to USB,
but this doesn't help.

Does anybody know how to solve this problem?

73's, Tom