I've clean install of DO 12.3.3. When I click on any image, I get an error (system can't found the path):
The bit of my tree with file collection folder (I've installed the DO with Russian laguage but then switch to English, why the marked images collection folder name is in Russian, not English?):
It looks like an issue with the Russian translation - there shouldn't be a . at the end of the collection name. If you edit the collection name in Preferences / Viewer / Behavior to remove the dot (or change it to English) it should work ok.
We'll make a change to prevent this from happening in the next update.