Since version 3.0 : bug in the HTML editor

That link 404s, but nothing in All in One SEO Pack should be affecting your font.
Use these troubleshooting steps to narrow down a plugin/theme conflict. https://semperplugins.com/documentation/how-to-troubleshoot-issues-with-all-in-one-seo-pack/

I have 2 sites and I only update on one site. On the other I have the previous version (2.X) and there is no problem

I’m glad to hear your other site isn’t encountering this issue. In the meantime, the first step is to follow the troubleshooting guide I linked to.

I found the problem, it comes from your css

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• This reply was modified 5 years, 9 months ago by Djib's.

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when I deactivate, it corrects the problem

• This reply was modified 5 years, 9 months ago by Djib's.

I have the same issue.

The writing font on the editor is not the same as it used to be.

Thanks for reporting it guys. I’ve opened an issue here: https://github.com/semperfiwebdesign/all-in-one-seo-pack/issues/2567

@djibs13 @lechon

We’ve released 3.0.2 which hopefully fixes this issue. Please let us know if it fixes it or not.

The font type issue still not solved, it is still the same.

@jianpey Please clear all browser, server, webhost, and plugin caching and check.

It is working now after cleared all the cache.
Thanks!