Forgive me if I am missing something. I have the standard out-of-the-box installation running on Vista
When I click on JPG/GIF files, etc., the file is also shown in the viewpane.
.TIF files were not displaying in the Lister window as thumbnails until I checked the Preferences > Lister Display Modes > Thumbnails Mode > User shell image extraction for formats Opus does not understand.
Now the .TIF thumbnails are displaying fine in the Lister, but not in the viewpane (which is just HEX/ASCII).
All of the test TIFF pictures I have here work fine, so maybe it's something specific about the images you are trying to view. Could you post an example image here so we can try it out?
It appears to be slightly malformed - the "ExtraSamples" tag is set to 999 which is not a valid value, and so the tiff library we use is rejecting it.
I can patch the tiff library to accept 999 as a special case, and the image will then show correctly in Opus. In googling this problem I found a few references to this value being written in TIFFs saved by Corel Draw - is that where your images come from? The general consensus seems to be that it is not a valid value for this tag.
Jon, you're a star. Please let me know when the patched file is available.
The file comes from plugin software for Photoshop called KPT Effects (formerly known as Kai Power Tools). The software was published by Procreate Software. It was subsequently bought by Corel and extended to support Corel Painter as well as Photoshop.
So the question is whether the incorrect use of the tag is a Corel thing, or whether they subsumed it when they bought KPT.