Hi Giulio, After disabling the plugin, like you did, you might also need to clear any server side caching capability (like Varnish) and you might also need to clear your browser cache. It has been occasionally noticed that these additional steps were required to be able to actually load the wp-login page. The issue was not the plugin in WordPress, but more about the various caching mechanism not being invalidated (server level and browser level) which then display a stale page from the cache and not from the live server.
Here are a few links to instructions to clear a few of the available types of cache; obviously it will all depend upon which hosting and caching services you are using for your domain. For Example:
If it is still not ok, then can you please consider posting the domain name (???) and perhaps links to screen shots to provide further details for analysis.
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This reply was modified 2 years, 3 months ago by john-lang-86.