Hi Ben,
Yes, you can hide and show tab links in a portal with actions. One way to do it is in the OnScreenLoad action set. On the screen designer, click the Advanced... button in the top left corner and skip to Step 2 of 5: Actions. From here you can choose the OnScreenLoad event. The action you want to use is called Show/Hide Tab Link. I just tested it and it seems to be working fine. Is this what you did? Can you give me a little more detail of where your actions are placed?
Jason
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