After updating to Android Studio Arctic Fox, I cannot use any custom theme

Question

After updating to Android Studio Arctic Fox, I cannot choose any of my installed themes. Invalid cache and restart didn't help ;) Also reinstalling themes still not solving this problem.

I updated AS 4.2 to Arctic Fox using Toolbox on the stable channel. I'm on win 10.

Maybe someone has an idea how to solve this issue?

What I can choose:

What I have installed:

Answer 1

Follow Simple Steps to Fix this

1. Rename the {path-of-android-studio}/lib/gson-2.7.jar file to gson-2.7.jar.disabled.
2. Restart Studio.

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where {path-of-android-studio} is by default C:\Program Files\Android\Android Studio on Windows and /Applications/Android Studio.app/Contents on Mac.

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The fix will be included in the next minor release of the 2020.3.1 Arctic Fox.

Found From issue-tracker

Answer 2

The bug still persists in release 2020.3.1 as highlighted here.

Renaming the gson-2.7.jar file works like a charm.