Ok after a bit of research, because of the way the changes are listed I think it's bit beyond my current abilities to fix these things at the moment. However, I do have a fix for you to get these windows working until Landiin can get to it and that is to simply go into your eXtreme directory and delete the files
Code:
eq2ui_inventory_guildbank.xml
and
Code:
eq2ui_inventory_merchant.xml
. This will allow you to use these features as they will begin to use the new default windows from SOE. I will keep doing some research into the issue and see if I can't find a better post explaining the changes and get it all working with Landiins Windows...