Welcome to patch 33, the patch notes say this, but what does it actually mean?
Increased the threshold for summoning Companions in some instanced gameplay spaces from 2 up to a maximum limit of 4 total player characters and Companions.
I hoped this meant I could summon more companions if I solo a dungeon, but it doesn't, so I wonder which instances can we summon both companions in?
Also, the update has changed the visual effects of Bastion's already great searing weapons ability, and now his whole body glows, it looks amazing! I was really happy with my current build on Bastion, but now I need to regear him in just augmented and quickened to get 100% uptime on this fire - reminds me of this.
#1 tip (Re)check your graphics settings periodically - especially resolution.