I can echo Craig O'Brien's report. Same versions,
Windows 10.0 2.3.508
Bootstrap
1.1.28
Resolution can be changed but is neither used when launching the game nor saved when exiting the launcher. My testing was done with a vanilla installation of the latest release.
Additionally, Java arguments were saved and are used when launching the process. Editing the launcher_profiles.json entry manually does not help either.
I got the update to:
and it does appear to be saving and using my custom resolution settings.