Publisher Beta, v1.7.0.293 for Mac: 15" MBP (2017), Mojave v10.14.4, 2.9GHz i7, 16Gb ram
Since the latest Publisher update, whenever attempting to export pages from Publisher Beta, Atom (code editor) opens "tempimage_#.ext" files. I have not opened or modified Atom since prior to the last Publisher update. I have since disabled all Atom packages and restarted my entire system with no change in behavior.
This happens for Publisher projects with one, several, and many pages... I am using master templates on all pages and have not confirmed if this occurs when not using templates.
Additionally when in the export dialogue and I select a different file type to export to, Atom opens more windows.
The export has been working despite this behavior.