Client won't start after patch 9.20

When i try to launch client nothing happens, just a couple of seconds loading then nothing, no error message, no logs. No ghost processes to kill, hextech repair does nothing. Anyone else having same issue and found a solution/workaround?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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