After returning to Arnika after visiting Trynton and the swamp, both the spaceport and HLL headquarters are locked. What have I forgotten?

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For the HLL headquarters you shall need to get hold of Marten's ID tag but for the spaceport clicking on the chain will make it fall.

(and then working the cypher lock attached to the door once the sign is gone)

In both cases that's the trouble. I have already been into the spaceport once but now I have returned the chain is back in place and I can't get rid of it

The same with HLL. I have already been in there but now I'm back there doesn't seem any way of getting Marten's ID read

What? That's news to me!?

??????!!!!!! How didya ever place the chain back??? And about ID Tag - if it's in characters inventory, put it into party inventory - i think this helps.

Reinstall. Your game has corrupted itself. If you have an intermediate save hide it before you reinstall to see if maybe not all is lost with that party...

Or maybe you were using some editors, eh? They can make such things happen...