[Orion] No TX Audio (sometimes)

[Sherman Banks]

I have 2.059d in an Orion I and I just ran into an interesting problem. 
While trying to work N8S split on 40M SSB, I did not have any TX audio. 
  But if I don't work split, I had audio.

After some experimentation, the radio seems to not like transmitting in 
the US portion of the 40M phone band when split.  I can swap the VFOs so 
that I TX low and I get audio. But that's not good.  I can swap the VFOs 
back to what they should be and my audio will be there for one 
transmission and then go away.

I then tried to swap the VFO A and VFO B buttons on TX/RX and Sub RX. 
When I tried to set them to TX on the right frequency there is no audio. 
  If I swap them to the wrong VFO, then it works.

No TX Audio
VFO A 7.212 TX Sub RX
VFO B 7.080 RX

TX Audio
VFO A 7.212 TX RX Sub RX

TX Audio
VFO A 7.212 RX
VFO B 7.080 TX, Sub RX

No TX Audio
VFO A 7.080 RX
VFO B 7.212 TX, Sub RX

TX Audio
VFO A 7.080 TX, Sub RX
VFO B 7.212 RX

It doesn't matter which VFO is on the Sub RX.

Is this a known issue with 2.059d and is there a work around?