v2.2.11 forced OpenGL mode at launch. You may want to switch back to DirectX if you prefer it for any reason (performance or rendering issues).
v2.2.12 : Fixed problem in v2.2.11
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Source: Steam Community (opens in a new tab)
v2.2.11 forced OpenGL mode at launch. You may want to switch back to DirectX if you prefer it for any reason (performance or rendering issues).