What specific URL are you looking at?

Sometimes I see this behaviour of the connector, usually on my old (and slow) home PC. In this cases, the connector icon is "webpage". Unfortunately, it is unpredictable and also it cannot be reproduced because a refresh of webpage helped me every time.

before I never had a problem with direct science but today impossible to load the metadata even by refreshing the page. May be a problem in the last update?

See adomasven't post, i.e. run through https://www.zotero.org/support/troubleshooting_translator_issues

Sciencedirect works in general with the newest updates.