If you try to access a page on the site editor by using the landing page it does not load the blocks, it stays infinite loading. For example https://.myvtex.com/admin/cms/site-editor/.

Try to access the site editor by a direct URL with its landing page. The blocks will not load and you will not be able to perform any changes.

You can access the site editor by its normal URL(without the landing page at the end) and navigate normally through the site.