Update: A new control in the premium Broker window can be set to automatically relist all of your Broker items whenever you open the window. Check it out here, about midway down the post!
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As you probably already know, a new Beta will start on August 29 for Game Update 123: Shattered Overture! Everyone can participate, and it's always fun to get an early look at all the shiny new stuff.
If you joined the previous Beta back in the spring with DarqUI, then you're essentially all set to jump onto the Beta server again this time. I suggest:
Download the new Beta files using the LaunchPad
Get logged in with at least one Beta character, either new or /beta copied from Live
Open your copy of the DarqUI Utility from the \BetaServer\UI\ folder
Get DarqUI updates (make sure you see the Patreon logo at the top!)
Use the Beta Tools page to copy some or all of your settings to Beta
Log in!
If you're having any trouble, or you just want to review the process, check out the all-in-one setup tutorial here. Scroll over to about 5:10 and 9:22 into the video to see the parts about Beta.
While I was poking around in the default Beta UI files, I came across something I think a lot of players are going to be very happy to see:

As hoped for, it looks like the game developers have come up with a nice clean solution to the auto-unlisting behavior (which appears to be a permanent policy at this point.) As soon as possible we'll get rid of the stopgap solution.