I've encountered unusual black squares in semi transparent textures for a while now, usually in processes that were resumed after the computer woke from sleep. For example I've seen the effect in the Battle.net launcher by Blizzard frequently, on different machines. But now I often encounter the effect in Unity in Play mode if I let the computer go to sleep. Restarting the scene fixes the display problem.
My 2 questions are:
- What is that effect?
- What do I need to do to prevent the effect from reaching my users?
In this screenshot there are 3 semi transparent particle effects on top of one semi transparent billboard, and at the bottom we see a part of an opaque sphere. The black squares seem to only affect a single one of the particle effects, and disappear if the effect is disabled, and reappear if it's re-enabled.
And here is the same effect in the Blizzard launcher: