If the Workbench ACT Start Page is blank, a common issue is due to a security policy FIPS being enabled on your computer.
You may need assistance from your IT department to determine if FIPS is enabled at your site.
This is an excellent article on the issue. You may want to have IT temporarily disable FIPS, then test the ACT.
https://www.howtogeek.com/245859/why-you-shouldnt-enable-fips-compliant-encryption-on-windows/
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