"Please wait while the accessibility scan is running ..." never completes

Describe the bug A clear and concise description of what the bug is.

I’ve set everything up as shown in the README, and I see the Accessibility tab in Storybook now, however it’s been showing “Please wait while the accessibility scan is running …” for almost two hours now for all stories. Is this expected or did I miss something?

Expected behavior I would expect the scan to take no more than 15 minutes or so on initial install.

System:

System:
    OS: macOS Mojave 10.14.6
    CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
  Binaries:
    Node: 10.17.0 - ~/.nvm/versions/node/v10.17.0/bin/node
    npm: 6.11.3 - ~/.nvm/versions/node/v10.17.0/bin/npm
  Browsers:
    Chrome: 79.0.3945.117
    Firefox: 72.0.1
    Safari: 13.0.4
  npmPackages:
    @storybook/addon-a11y: 5.3.3 => 5.3.3
    @storybook/addon-actions: 5.2.8 => 5.2.8
    @storybook/addon-console: 1.2.1 => 1.2.1
    @storybook/addon-knobs: 5.2.5 => 5.2.5
    @storybook/addon-links: 5.2.8 => 5.2.8
    @storybook/addon-notes: 5.2.8 => 5.2.8
    @storybook/addons: 5.2.8 => 5.2.8
    @storybook/react: 5.2.8 => 5.2.8

[chemoish]

However, if you are upgrading

https://github.com/storybookjs/storybook/pull/9697/files#diff-177dcef0a5b481c2c87db87f7cdf200dR106 (Sentence that stopped halfway)

Even though the documentation states 5.3+, it is not accurate. Looks like 5.3 still requires decoration configuration. Would be great to specify requirements for that version.

import {addDecorator} from '@storybook/react';
import {withA11y} from '@storybook/addon-a11y';

addDecorator(withA11y);

preview.js

[shilman]

Did you set the withA11y decorator`?