OK, thanks for getting back to me. I have a sort of workaround whereby I add an extra (empty) path to my Stadium Preset, with the Input Block set to Instrument 1 and the Output Block set to USB 1/2 (with Global Ins/Outs for USB 1/2 changed to Direct Out). This lets me record a DI track from the empty path, while monitoring with the effects on the other path (Output still set to Matrix). I then change the USB 1/2 settings back, and re-amp immediately to get an initial version of a 'wet' track.
This does seem a bit of a 'miss' though. There is a whole section of the manual dedicated to using USB7 or 8 for direct out in parallel with a stereo effected output on 1/2. It surprises me that there isn't more reference to this issue when I search for it, which makes me wonder if it only happens with specific use cases.
Do you have any feedback from Line 6 for your bug report on either the scope of the issue (does it really affect everyone, or just particular DAWs etc), or the timescales of a fix?
Thanks again,
H