This is a quick fix for the last problem with the DM client on 1.12 trying to connect to a MP module.
The problem is related with custom portraits, a new function inserted in this 1.12 patch. It seems that the dm client have loading issues in the party bar when the players are using custom portraits. The dm client fails to load the UI and the DM character cannot join the module.
This was an easy fix I thought when the problem came to the chat, Senalaya from Dragoncoast edited the xml and tested it in his PW and it seems this fixes the problem (although you will not able to see the portraits).
It comments out the custom portrait UI element and removes the OnUpdate and OnRender properties for the portraits.
Download, unpack and place the file into your "MyDocs\Neverwinter Nights 2\UI\custom\" folder.
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