My party just had an issue getting into Ascalonian Catacombs on the Stormbluff Isle server.
The first attempt, we had a full guild group formed. Our first party member was at the dungeon entrance and walked through. The rest of us were in the Plains of Ashford and got the popup. We all clicked to join our party member….dialog disappeared but nothing happened.
Then we all got to the dungeon entrance and walked in. We all chose story mode but each got into a separate instance of the dungeon. The first member could no longer get into the dungeon at all.
At this point we all exited and none of us could walk back into the dungeon. We would get the popup to enter story mode but after clicking ‘Join’ the dialog would disappear leaving us outside.
We all shutdown the client, relogged and reformed the party. We used the ‘Join party member’ menu option to all get into the same instance of Plains of Ashford. I walked into the dungeon, chose story mode, and got in. Then I asked my party members to walk in as well. We all got in but we were each by ourselves in a separate instance.
For reference, two of our members were lvl 30 and had not run the dungeon before. The other three had completed it on story mode and have not attempted explorable mode.