Hello,
Submitting this in case it helps someone else.
I was having the issue today where I would try to view a pdf in Laserfiche and it would appear for a split second and then close. I recently got a new PC and had to reinstall the Adobe Creative Cloud. When asked if I wanted to use Adobe as my default pdf viewer, apparently for some reason I said no.
I had also logged out of the creative cloud.
And......I had somehow decided to set Microsoft Edge as the default pdf viewer on my pc (not sure why I did this).
After having the issue today and battling it for awhile, I finally logged back into Creative Cloud (staying logged in), and set Adobe up as the default viewer on my pc.
The problem went away. In my situation, it appeared that one of the following (or more): being logged out of Adobe, not setting Adobe as the default pdf viewer on my laptop, setting Microsoft Edge as my default pdf viewer could have been the issue?
In Laserfiche, in the View Option I did have Open with "The Laserfiche Document Viewer" selected.
Christine