Limiting 'Mark Read' button to being clicked just once before disappearing for that message permanently

[pc001]

Yes you’re right. I came across this interesting response by @sridharan.s on another post:

@sridharan.s

It seem to me that sometimes what happens is that it’ll run the conditional calculation on, say, a custom-state that is still null (because it hasn’t loaded yet) which causes the condition to be met temporarily, until the custom-state’s value is set.

It’s one possible explanation. I wouldn’t be surprised if there are more.

I have now changed my ‘visible’ statement to say: When Current User’s Journalist is “yes” and Parent group’s Conversation’s Mark read is “no” and conversation_window’s Conversation is not empty.

Essentially I’m waiting until the Conversation is not empty before displaying the button, and this seems to have solved the issue (I also tried 'Page loaded (entire) but that didn’t work).