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Works fine here on OS X 10.11.6 and Lr 2015.12 Ps 2017.1.1
So... I did some more troubleshooting and found out that additional images aren't opening in Photoshop ONLY when I minimize Photoshop after an edit.
So when I'm in Lightroom and merging to Photoshop for the very first time, Photoshop opens with no problem and it will continue to merge new images as long as I don't minimize Photoshop. Where the problem occurred, was after the Photoshop edit/merge, I would cmd+h to hide Photoshop. Once I did that, the next images I tried would not open.
I'm on OS X 10.12.6
I can ALMOST duplicate this glitch/bug. For me, if Photoshop is hidden than Photoshop will unhide but only one photo is loaded and a layer called Merge to HDR Pro is created but the merge window never shows up. Like your situation it works fine with Photoshop unhidden. You should post this as a bug here as Adobe doesn't participate here very much. Photoshop Family Customer Community Please be aware that Adobe's bug fixing record is not great.
OS X 10.11.6 and Lr 2015.12 Ps 2017.1.1