User unable to add block when add blocks and add stacks permission enabled

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Good morning,

I am trying to set up two groups: Writers and Editors. Neither of them can add blocks to a page. They can edit blocks and delete blocks.

I've checked and the system says they have permission to add both blocks and stacks in >stacks & blocks>block & stack permissions. I have cleared site cache, browser cache and tested from another machine. Is there another step to allow the adding of blocks to a user group?

I have advanced permissions enabled
I am running C5 8.3.2

thanks

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