OK, so I'm home and this is interesting!
If I put the reverb in the X slot, I get the wet / dry behaviour as I would expect it to be so it works absolutely perfectly. If I put the same reverb in the actual reverb slot, I get the issue. Here is exactly what I am doing:-
I am loading a commercial profile that I like which has regular reverb already enabled. I am then pressing the 'reverb' button on the Profiler and scrolling through to the new presets. I am selecting the 'Angel' preset which tells me that I am using the new Ionosphere reverb. I play. I hear a very clear 'dry' guitar signal and I hear the choir come in afterwards so the reverb is working / sounding impressive but the guitar is clearly audible as a guitar.
I go in to edit and notice that the mix is on 70% on this preset. When I increase past 100%, the display shows 100.0/90.6%
If I keep increasing, it finally reads 100% (wet).
At all points from 0% (dry) to 100% (wet) there is absolutely no difference in my dry guitar signal - the dry guitar itself is just as audible as it is when I am at 0% (dry). The mix knob ONLY affects the level of the choir and the choir is not there at all at 0% (dry) which is, of course, expected. What it should not be doing is allowing me to hear the guitar at all when it's 100% (wet).
I have checked the Parallel Path and it's off. I am running to SPDIF and have also checked by plugging my headphones directly into the Kemper - the behaviour is the same.
I am making no other changes to the preset apart from altering the mix.
Out of curiosity, I then put exactly the same reverb into the X slot and it works completely perfectly - at 100% wet, I cannot hear my guitar, only the choir.
Any ideas on what to do? I updated via rig manager and everything else appears to be working OK. Well, everything I use which isn't much as I'm a simple kind of guy (mostly just load a profile that makes me smile and go for it plus put on the occasional effect).