Long shot - Can you try the same thing you did last time turning off HDR and DPI scaling off?
I have DPI scaling off, actually it works fine with DPI scaling on (although it looks like crap), wasn't aware of the facility until now.
If I set DPI to "ON" in the VSTi GUI then I can confirm excess space either side in Battery's (latest version) GUI.
The HDR setting either off or on is not affecting the outcome. It would appear DPI setting in the VSTi Gui is tho'.
Hope that helps.
You really should have pulled this out into it's own thread, as requested ?
Regards