-At ~9:50 p.m. CT, I opened the Rig Builder and the window popped up.
-Without messing with it (90% sure), I did a solo playtest.
-The window was not present during the playtest.
-When I stopped the playtest, the window popped back up without me clicking the Rig Builder button.
-The button was not dark gray to indicate it was open.
-When I clicked Rig Builder to close it, the window went away but the button turned dark gray as if it was now open.
-I have no idea what I did to cause this. I was doing my usual stuff.
Inverted Rig Builder button toggle pictures:
Blame John.