I'm not enjoying the new functionality of the Edit IPTC-IIM dialog. I love that XNView allows access to the Caption field and I like to use this dialog to run through a whole folder of photos quickly captioning them. It used to be easy to go from the Caption field (Alt-C) to the arrow for next image with a tab or a shortcut - I can't quite remember but it was quick. Now for *every* image I have to click the Write button first (really? why add this?!) and if I want to get to the arrows for next / previous image it's a whole lot of random tab-pressing. This dialog now ties you to your mouse when it should be all about typing and I'd like to suggest that the UI is revisited to take into account ease of workflow. Previous versions were a little clunky but definitely not this bad.
Having to click Write also adds a minor bug because if Write isn't pressed, the arrow buttons are not greyed out but they do nothing. It's just not obvious and not a great UI.