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MSP430FR6989: MSP430FR6989 Launchpad dev board UART1 question

Part Number: MSP430FR6989

I'm using an MSP430FR6989 Launchpad eval board. It runs a simple piece of code that echoes everything that comes in on UART 0 to UART 1 (which, on the eval board, is routed to the USB based application com port).
I have two Teraterm terminal emulators hooked up to these two ports. 
This runs fine at115200 baud: what I type in one terminal, appears in the other.
When I switch to 230400 baud, I get garbage in Teraterm connected to UART 1 (the USB application com port).
When I debug it, I see that I get the data from UART 0 just fine, so it handles 230400 just fine.
Is UART 1 (routed through USB) perhaps speed restricted, in some way, or should this work?
If it should work, would anyone have an idea what could go wrong? I use common code to set the baud rate for both ports.

~ Paul

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