Thank you but the article is of no help what so ever. How can it be,
from edit their is no choice for preferences, just where do you get
most will edit in Photoshop but some will not, as if some files with photo info have no been sent to Photoshop from Lightroom.
Also could you make sure that the images that don't open in Ps are actually not missing in Lightroom ?
You will see a " ! " sign on the top rightof the image thumbnail as shown in the image below
If so refer How to find missing photos in Photoshop Lightroom and locate missing images.
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Adobe has released a new version of Photoshop today and if using Photoshop CC, you may wish to install it to see if it helps with your issue. Quit Lightroom and don’t re-launch Lightroom until the new version of Photoshop is installed. LR should then automatically recognize the latest version of Photoshop on next launch. See my blog for further information on Photoshop CC 2015.5