For now, I found this issue with Battery 4 and Groove Agent 5 SE.
When I’m working with these instruments, master out suddenly gets panned hard right. (On GA, the kit gets panned hard right too)
And if I reload the preset, it gets fine.
But it happens again soon.
Hi,
What kind of MIDI CCs do you send to the instrument?
I don’t send any MIDI CC.
Do you use a midi controller with these that you don’t use with other instruments??
NO, I don’t use any.
Can you please make sure that all your pads are routed to the Kit Mix?
Otherwise please check also the pan settings of the other outputs/busses.
Can you please also have a look at each pads’ individual pan setting?
Are they all on anything but full right?
All pads are routed to the Kit Mix.
All the pan settings are at Center.
Everything is on full right.
As if it is on mono channel.
Hi,
As you mentioned, this happened in Groove Agent and Battery. Therefore I don’t think it’s in some Groove Agent setting.
I’m still guessing, you send MIDI CC10 (Pan) accidentally at some point.
No it’s not.
I double-checked it.
Hi,
Does it mean, you fixed it (somehow) and it happened again?
If I reload the preset, it gets fine.
But it gets wrong soon.
You said Battery 4 as well correct?
I’m not sure about B4, but in B3 preferences there is a setting that can absolutely screw with your pan settings and randomly change them just like you sent a CC, but you didn’t. I speak from frustrating experience here.. 
I’ll check in a day for the setting as B4 may contain the same preference.
EDIT: in B3, make sure in preferences that "use cc7 cc10 data on master volume/pan" is turned OFF.
I would think there might be the same preference in B4.
I would not know if this is a preference in GAse5.