I had this same issue but followed the fix mentioned and it worked.
I logged in today pre-cordial rep with venari, did her quests to get to cordial, and was locked out of the vendor items still. I proceeded to leave the maw via waystone, logged out in oribos, logged back in, re-entered the maw, and all the items were unlocked.
The rep-locking bug seems pretty widespread but at least jumping in and out of the area works fine. (I did not extensively test other fixes, but I did enter Torghast before returning to venari and that did not work)