After the update to Snagit 2019.1.2, no images are visible in the Library. Only the browse pane is visible.
This is a known issue that is fixed in Snagit 2019.1.4. Select Help > Check for Updates in Snagit to install the latest version.
To fix the problem, hover the cursor over the right edge of the window so that the cursor changes to a horizontal double arrow, then click and drag to the left to resize the browse pane.
The cursor should change to a black double arrow. A white double arrow will resize the entire Window rather than just the library section.