Graphics glitch constantly

iMac user.

iMac (Retina 5K, 27-inch, Late 2015)
4 GHz Intel Core i7
16 GB 1867 MHz DDR3
AMD Radeon R9 M395X 4096 MB

Yesterday, everything was running great. Today, after last patch, (8/10/19), the game started in a small window and graphics were glitched. I manually widened the window.Unfortunately the glitches are all over the game. I can send screenshots if this helps just let me know how because i can’t embed them! Thank you. (Already run repair and reset in-game options).

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Hi Desydocus

The Minimum Requirements of Hearthstone list OS X 10.12 (Sierra) so if you’re still running 10.11 (El Captain) then you’d need to upgrade to a more recent version of OS X

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I Found the solution! For El Capitan and probably other versions as well. Just add this to the custom parameter settings in the setup: -force-opengl

All the graphical glitches are gone now! Amazing!