I hope you would assist me, I have performed same actions as suggested by one of the article "Add to trusted certificates" button is grayed out" to verify it i click on singnature properties>Show Signer's Certificates>Trust it still shows crossed mark.
Actions performed was : navigated to "Edit>Preferences>Signatures>Identites & Trusted Certificate>More>Trusted Certificates>Edit Trust.
Please let us know which program you are having problems with. Someone will be along to move this post to the appropriate product forum, where you are more likely to get an answer to your question.
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