I still have a few computers here and there with X on it, and it doesn't have this problem and never did. Please let me know what you guys think, if you can replicate it, and any ideas to fix. My searching has not led me to anyone discussing this, but this cannot possibly be unique to me and I would assume everyone could recreate this, it's just most users probably do not use the Preview Pane. One thing is consistent, if the Preview Pane is activated.the first double click of a file (while preview is loading in the preview pane) never opens the file in Acrobat. Every double click (after setting it back to double click of course), opens the file in in acrobat as it should. If I turn off the Preview Pane, it works as it should.

So it's not a mouse, double clicking timing issue. A single click of the file won't open it.another single might not. If I go into the Options of the windows file explorer and change the settings from double click to open a file, to single click (where it highlights on hover), same thing. If I press enter on the keyboard, opens instantly. I go to a PDF, double preview loads.i double click again.50/50 shot it might open, might not do anything. With this pane open, a simple double click on a PDF doesn't work consistently. This is a law firm and our paralegals like having the Preview Pane open in their windows explorer when dealing with PDFs. In any case, on all computers, including a brand new one fresh out the box, office freshly installed on it, windows 10 freshly patched out, Acrobat fresh installed, the same problem is happening. Obviously we were forced to due to our office updating to office365 and my users wanting their Acrobat tab in Outlook back.

We recently finally took the plunge and updated to Acrobat DC/2017 2 weeks ago after years and years on X.

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