I can not buy gem it gives me blue blank page please make patch and update to fix this problem? I’m in Asia

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I can not buy gem it gives me blue blank page please make patch and update to fix this problem? I’m in Asia.

I did this , Start the game in windowed mode.

  1. Click the Blizzard icon on the Battle.net desktop app.

  2. Select Settings from the dropdown menu.

  3. Click Game Settings and check the Additional command line arguments box under Heroes of the Storm.

  4. Type -Displaymode 0 in the box and click Done.

What do i do next?