Thanks for reporting Mark!
I fixed it in ENH+BUG for the visual DICOM browser by Punzo · Pull Request #1203 · commontk/CTK · GitHub
the issue was that I didn’t updated the schema file which is used only by the old query/retrieve widget (and this widget unfortunately seems to lacks an automated real scenario test).
I am not sure when the PR will be merged. For the moment, you can checkout the PR for your local build. I will give an update as soon as the PR will be merged 
Also please feel free to try the new query/retrieve of the experimental visual DICOM browser (more info at New Feature: visual DICOM browser). Any feedback would be very appreciated.