Starting Hugin by double Clicking a project starts Hugin but doesn't open the project.
Hugin 2013.0.0 Mac OS X 10.6.8 and OS X 10.9
Happens here too (tested on Mac OS X 10.6.8 using Hugin 2013.0.0). However a second double click (when Hugin is already open) works as expected.
Same happens when dragging a pto file on the dock icon of the closed application.
Please test 2016.2 version and report back if it is fixed. Niklas did some work on the Mac OS side.
Hugin 2016 requires OS X 10.11. I'm on OS X 10.10 and can't test. In Hugin 2014 on OS X 10.10 the project is opened but the contents of the clipboard is replaced by a TIFF image.
[Expired for Hugin because there has been no activity for 60 days.]
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Happens here too (tested on Mac OS X 10.6.8 using Hugin 2013.0.0). However a second double click (when Hugin is already open) works as expected.
Same happens when dragging a pto file on the dock icon of the closed application.