https://bugs.winehq.org/show_bug.cgi?id=5129
--- Comment #36 from Grant ggustaf@math.utah.edu --- Workarounds for the thumbnail bug, new Faststone 7.3 (June 2019) install under Wine 4.0 in Linux Mint 19.2. Applies to Ubuntu 18.04 LTS. Linux Kernel 4.15.
These workarounds do not modify the install at all: expect them to work as well on modified installs or installs from PlayOnLinux.
Symptom: Thumbnails are generated but only a few are visible. Issue: Cannot find the image or the file name. Workaround: Find the image/filename another way.
Workaround #1: Click on the empty spaces after the visible thumbnails. The image shows in the PREVIEW sub-window lower left corner of the FastStone window. Double-click on the PREVIEW sub-window for full screen, which shows the file name as well. Not useful on large directories: see #2 below.
Workaround #2: Double-click on any visible thumbnail. The image is displayed in full screen. Use arrow keys to find the image desired. Press ESC key. The image will be in the PREVIEW window, ready to crop (key "x"), resize (key ctrl-R), save (key ctrl-S).
Workaround #3: Applies to crop and resize of an image. Find any thumbnail in the directory, click once to make it appear in the PREVIEW sub-window lower left of the Faststone window. Press "x" to launch the crop window. Click on the left or right arrow icon in the crop window, which loads a new image into the crop window and also into the PREVIEW sub-window. Proceed as in workaround #2.