I noticed that Luminar 3 (v3.1.0) cannot open for Quick Edit a basic screen capture JPG/PNG file. The same file, however, can be opened in Luminar 2018.
For example, here is a screen capture of this bug report title which cannot be opened in L3 but can in L2018:
How to reproduce (on macOS Mojave v10.14.4):
1) Cmd+Shft+4 to screen capture a portion of the desktop
2) Open for Quick Edit in L3 (see brief progress indicator but file does not open)
3) Open for edit in L2018 (file opens)
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