When I go to transmit on Data (BPSK), the rig will only enter transmit
when I have split mode enabled.

Here's a typical scenario:

1. tune rig to 14070/data/lsb; D-type is set to USR-L; RF power is at
25 Watts. Antenna is dipole tuned for 20M.
2. open my software (Digipan)
3. pick a few streams to 'listen' to. No problem, here I see text.
Receiving doesn't appear to be a problem.
4. when I pick a frequency on Digipan to CQ - move the marker to, say,
140725, the rig will enter transmit mode by switching to what I
have stored in VFO-B. If I don't have split mode enabled, it doesn't
enter TX mode.

If VFO-A is tuned to 14070/data/lsb and VFO-B is tuned to, say
14077/data/lsb, it will not transmit. If I tune VFO-B to
14077/data/usb it still will not transmit. If tune VFO-B to 14077/usb
(unselect data mode), will transmit. Again, in these situations I have
the marker on Digipan around 14070-14074 or so. If I hit VFO-A=VFO-B,
then it won't transmit either and it won't do it all if the
frequencies are within 5Khz of each other.

So, in that scenario what it looks like it's doing is transmitting at
14077 USB (data is not lit). When TX is done, my display switches back
to VFO-A and what I was tuned at - 14070/data/usb.

Is this normal? Because, it looks to me like it's trying to send data
without 'data' being selected on a frequency I didn't want to use.

What am I doing wrong? The manual says nothing about needing to use
split mode for Data and if I don't have split enabled, the rig will
not transmit.

Specifics: WinXP using Digipan (I have tried fldigi, Hamscope, and
WinPSK, no luck with those either). Rigblaster Nomic (jumpers are
correct (set to the same as the 897) and double-checked.

Any tips? Or, is this the way it should work. It seems odd to me and
appears not to be working properly.